Thl 4400 engineering menu. Engineering menu in Android phones. Using secret combinations

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Android-based gadgets are becoming increasingly popular among users due to their ease of use and high functionality. But at the same time, not everyone knows about the possibility of more personalized and flexible settings for their phone. For these purposes, an engineering menu is usually used, which includes a number of different settings - a program for automatically recording conversations, increasing the volume of the device, a huge number of different add-ons for the radio.

Unfortunately, this menu is not available to everyone. Some manufacturers simply remove the program to log into it at the last stage of pre-sale Android setup. Also, the engineering menu is available for owners of Android devices with a processor only from MTK; trying to run it with a processor from other manufacturers is useless.

Special commands and applications

To enter the engineering menu, you must enter a “secret code”. For different manufacturers, the “activation code” may be different, but there is one universal one that is suitable for almost all ANDROIDs - *#*#3646633#*#*.
You need to enter it in the dial and call window. Most often, immediately after entering the code, you will be logged in immediately, but on some devices, in order to log in, you may also need to press the call key. If the program does not launch to log in, you can try entering other launch combinations that match your phone model.

Samsung – *#*#4636#*#* or *#*#8255#*#*
HTC – *#*#3424#*#* or *#*#4636#*#* or *#*#8255#*#*
Sony – *#*#7378423#*#*
Huawei – *#*#2846579#*#* or *#*#2846579159#*#*
MTK – *#*#54298#*#* or *#*#3646633#*#*
Fly, Philips, Alcatel – *#*#3646633#*#*

If all of the above steps were unsuccessful, you can try downloading a special application on Google Play to launch the engineering menu. If even after installing a special program (most often “Mobile Uncle”) you were unable to enter the service menu, it means that the engineering settings launcher on your phone was removed, you can install it again.

And interesting features hidden from prying eyes.

Why are they hidden? Firstly, so that an inexperienced user does not break anything, and secondly, they are needed in especially rare cases and are not used regularly. Today we will talk about the engineering menu - a section for programmers, testers, geeks, experienced users and those who want to get into the very “heart” of gadget settings.

What is an engineering menu?

We are talking about a special program or system section that developers usually use at the final stage of configuring the software platform of a mobile device. With its help, they make final changes to the operation of the device, check the functioning of various sensors and test system components. Also, the hidden functionality of the service menu is used to obtain a large amount of system information, conduct various tests (about 25 pieces) and configure any Android parameters - various sensors, mobile networks, equipment, etc.

The engineering, service or system menu is available on smartphones and tablets running on a MediaTek processor. On the Qualcomm chipset it is either reduced or absent altogether.

Attention! This section is intended for experienced users who bear full responsibility for the consequences. Careless actions can harm the file system and render the smartphone unusable.

How to enter the engineering menu?

To enter the engineering menu, you need to enter a special command in the dialing application: *#*#3646633#*#*. On some versions the code *#*#4636#*#* or *#15963#* may work.

If the engineering menu code on Android does not work, or there is no dialing application on the phone (relevant for tablets that do not support calls), the MobileUncle Tools or MTK Engineering applications, which can be downloaded for free via Google Play, will help.

After entering the command or launching the application, the desired section will open. It may close immediately - you need to have “Developer Mode” activated on your smartphone. To do this, go to the gadget settings, find the kernel version there and quickly click on it 5-10 times in a row.

Engineering menu functions

The engineering menu is divided into several categories, each of which will be discussed separately.

Telephony. All settings related to mobile communications are located here. For example, you can activate or disable certain BandModes (frequencies for 2G/3G/4G operation), check the operation of SIM cards, and even disable mobile data transfer in the background.
Connectivity: Configure Bluetooth, Radio, Wi-Fi and Wi-Fi CTIA settings. For example, in the radio settings you can specify the radio wave, antenna type (you need to use headphones) and sound format (mono or stereo). The radio will play straight from this section.
Hardware Testing. In this section, you can configure the operation of various components of the device, in simple words, hardware: sound levels of headphones and speakers, adjusting microphone sensitivity, various camera parameters (photo aspect ratio, adjusting ISO, HDR, focusing and much more), operation of the touchscreen, sensors (calibration right there) and so on. This category is very large and global; you need to understand each section separately and have serious knowledge and skills.
Location. In this category, you can configure GPS operation, see how many satellites the gadget has picked up, and simply conduct testing.
Log and Debugging. Here, logs (logs) of the battery are kept (percentage of charge, voltage, operating time, temperature) and other functions little known to the average user.
Others. Contains two functions also unknown to the average user.

Engineering menu settings

The engineering menu opens up enormous possibilities for customizing the phone; we will consider the most interesting ones in detail.

SAR Test - determining the level of harmful radiation from a smartphone or tablet.
Connections - testing available wireless connection types: Bluetooth, Wi-Fi, WLAN CTIA and FM receiver.

Audio - adjusts the sound in the speakers, microphone and headphones. About how to increase the Android volume through the engineering menu.

Camera - configure various camera settings.

Turning on the current camera - the operating current of the camera is displayed (in our tablet it is 2 mA).
Load test of the CPU (central processing unit) - checking the stability of its operation, identifying errors in the operation of the processor-memory channel, testing the cooling system and power supply of the processor.
Device Manager - activate automatic SMS registration, manage configuration parameters.
Disable detection - adjust the signal frequency.
Display - Sets the pulse width modulation indicator cycle, which affects the perceived brightness of the screen by quickly turning the backlight on/off; backlight adjustment; controller behind the vertical and horizontal lines of the display.

Wake mode - its activation will not allow the device to “go” into sleep mode.
IO - management of data input/output operations.
Memory - detailed information about the RAM module.
To a certain extent - detailed information about the battery (the strange name of the section is most likely due to errors in the automatic translation of names in the application, but there is no option to switch to English).
SD card test - the name of the tab speaks for itself.
Touch screen - checking the sensitivity and response of the display when pressed, as well as setting its additional settings.
USB - testing the operation of the USB port.

UART/USB switch - switching between two data transfer modes.
Sensor - calibration (adjusting clarity and sensitivity) of the touch screen. Standard methods.
Location - testing the GPS performance and determining the exact location.
Battery log - detailed information about the battery and the ability to activate the recording of battery consumption information.

MTKLogger - collection of system logs (MobileLog, ModemLog and NetworkLog).
Temperature sensor - shows the battery and processor.
Font parameter - change the font size.

When installing the application, some features may not be available without .

Xiaomi engineering menu

Despite the fact that our test Redmi 2 runs on a Qualcomm Snapdragon 410 processor, it also has the functionality that interests us. To enter it, you need to tap on the “Kernel version” item several times in a row.

The menu is represented by five items:

Automatic Test. Automatic test of all device parameters.
Single Item Test. Each of the 25 tests is taken separately. We will talk about this in detail below.
Test Report. Report on the completed texts and their results.
SW add HW version. Information about the smartphone version, IMEI and other numbers.
Device View. Smartphone hardware data.

Of course, the most interesting point is the Single Item Test, where you can take a huge number of tests.

Let's make a reservation right away that there was no way to configure anything in the device we tested - only a functionality test. At the end of each procedure, you need to note its status: successful (success) or not (failed).

Key - functionality of physical buttons. Interestingly, it was not possible to complete it successfully, since when checking the power button, the smartphone turns off.
Backlight - display brightness.

TouchPanel. The touch screen test includes two procedures: “Crossed calibration” and “Touch panel calibration”. The first one checks so-called “swipes”, the second one checks single taps on the screen. An easy way to calibrate your display.

TFlash. Testing a memory card with two results: either everything is fine, or the card is damaged.
Bluetooth. Searches for available devices.
SIM Card. Test for the presence of SIM cards.

Vibration. The gadget vibrates - everything is ok.
RTC (Real Time Clock) - operation of the built-in clock.
Speaker. Testing the conversational speaker. We didn’t understand how to get through it. We will be grateful if you can tell us in the comments.
Receiver. Translated as receiver, receiver, but music plays during testing.
Headset. Testing the 3.5mm jack to detect headphones, play sounds, and support headset control buttons.

LED. Notification indicator, everything is obvious here.
FM (radio). Click Search, and if you hear noise in the headphones, then everything is working properly.
Camera. Everything is obvious: a test of the main and front optics, as well as the flash.
Battery. An informative section with information about the correct operation of the USB cable (charging), the condition of the battery, its charge level and temperature. Similar data can be obtained more.

Wi-Fi. Detection of nearby access points. There are no settings.

Torch (flashlight): shines/does not shine.
The loopback test includes a test of the spoken microphone. First, click Recording, then Playing.
LCD. Screen colors.
GPS. Detection of available satellites.
Gyro (gyroscope). Three parameters - X, Y, Z - change depending on the position of the device in space.
G-sensor (Accelerometer). Rotate the gadget in all planes and turn it over. The three parameters should be ok.
Proximity Sensor. It is usually located near the speaker and is designed to dim the gadget screen during a conversation, thereby eliminating accidental clicks.
Optical and Magnetic Sensor (optical and magnetic sensors) - points we don’t understand, share your knowledge in the comments.

After passing all tests, you can go to the Test Report section. As you can see, our “animal” is in excellent shape and has passed all the tests, which is very pleasing.

conclusions

Above we have listed the main sections of the engineering menu available on the tested devices. Now let’s summarize what features the user receives during installation:

Formatting, restoring to factory settings.
Testing the operation of individual elements of a smartphone or tablet, such as sensors, touch screen sensitivity and calibration accuracy.
Detailed information about the device and its parts. For example, you can track battery consumption since the last charge and view statistics on the programs used.
Energy optimization. Alternatively, unnecessary frequency ranges are turned off. In Russia, the standard indicators for working in 2G and 3G networks are 900 and 1800 MHz, while in the USA they are 850 and 1900 MHz.

The engineering menu provides access to manual configuration of the “hardware” part of the smartphone. To enter you need to enter a special code or install an application, but there are a number of features that are worth paying close attention to. If you were unable to enter the engineering menu the first time, then you did not take into account the features of the device. It is worth immediately clarifying that any interference with the operation of the device may lead to its inoperability and loss of warranty.

Hidden capabilities of the system

At the last stages of setting up a smartphone, developers test the system for errors and check the operation of all sensors on the device. Especially for this, Android has a special subroutine built into it - the engineering menu, which provides access to hidden settings of the Android OS and allows you to reconfigure them yourself. In addition, the menu contains detailed information about the device. The full list of menu options is known only to the platform developers, so you should make your changes with caution.

Secret paths of developers

To enter the engineering menu, dial the code *#*#3646633#*#*. On some models, you additionally need to press the call key. It is worth considering the features of phones: for different brands there are different combinations of numbers. The Android version does not affect the functionality of the engineering menu.

Enter a special code to enter the engineering menu

If no problems arise, you will be taken to an additional menu for fine-tuning your smartphone.

Enter the menu subsection

Depending on the system version and processor model, the engineering menu may be incomplete or missing. In the photo above there is a subsection of the menu with elements for testing smartphone sensors, setting up a USB connection, and performing internal and external memory tests.

If it doesn't work out the first time

Not all devices can access the engineering menu. Let's look at a number of common problems and ways to fix them.

Android is a complex Unix-based operating system. If you can’t do something, you haven’t taken into account all the nuances of the functioning of a particular subroutine.

List of special codes

One of the common reasons for blocking entry to the engineering menu is an incorrect special code. The combination of numbers depends not only on the device model, but also on the type of processor. For example, most devices based on the MTK chip are equipped with an engineering menu. If we talk about Qualcomm, not all smartphones based on this platform have an engineering menu built into them. The list of combinations is given in the table. If you don't find the one you need, try entering a different combination.

Table: code options for different Android models

DIY engineering menu

If none of the special codes work, don’t worry. There are many applications on the network with engineering menu functionality. It is worth noting that the MTK prefix in the names eloquently indicates compatibility only with MediaTek processors.

The first option is Mobileuncle MTK Tools. In addition to the necessary set of settings, this program has several additional functions: firmware update, recovery update, GPS receiver improvement mode and much more.

Mobileuncle MTK Tools provides a set of settings

Another program is MTK Engineering Mode. The program completely replicates the standard engineering menu.

MTK Engineering Mode repeats the standard engineering menu

For those whose device is not equipped with an engineering menu, there is another option: installing third-party firmware. Assemblies from third-party developers often contain a wide range of customization settings.

Where to begin

When you first enter the menu, you can get lost in the jungle of parameters.

Engineering menu settings

Settings open up enormous possibilities for users.

Depending on the hardware platform, some items may not be available or may be missing.

In this section you can configure mobile communication settings.

Auto Answer. You can enable or disable automatic answering of an incoming call.
Band Mode. Allows you to manually select the frequency range for the GSM module to operate. You will see all technologies and frequencies for them supported by your smartphone model. If you wish, you can uncheck bands that are not used by your carrier. This will significantly save battery power. To save the settings, press the set button.
CFU Setting (Call forwarding Settings). The option enables or disables conditional forwarding. It must be supported by the operator.
AT Command Tool. A utility for developers that supports AT commands. This menu item will be of interest to programmers and developers. Using this menu, you can perform various queries directly to the system without visual add-ons.
Modem Test. Configuring the compatibility of the “access point” option with various types of connected devices.
Network Selecting. Here you can select mobile communication standards (GSM, WCDMA, LTE). For additional energy saving, turn off unused ones.
NetworkInfo. Select one or more options to display information about the status of cellular communication parameters. Once selected, open the additional menu (three dots in the upper right corner) and click Check Information. This option is convenient for checking the quality of cellular operator services.
GPRS. Setting up a connection to the mobile Internet, selecting an active SIM card (if there are several of them).
HSPA Info. Information about the 3G network if supported by your mobile operator.
Mobile data service preferred. The Internet will be given priority over voice traffic to increase data transfer speeds. Incoming calls may not go through.
Fast Dormancy. Allows you to save battery energy in third generation networks. The option must be supported by your telecom operator.
RAT Mode (Phone Info). Allows you to select the priority communication standard. You should change the parameter carefully, it blocks the settings of the Network Selecting item.
RF De-sense Test. You can select a frequency range and a specific channel to check the communication quality.
SIM ME Lock. This subsection allows you to configure the regional parameters of the GSM module (MNC, NCC) manually.

Photo gallery: mobile communication parameters

We get to the main window of the subsection Enable or disable auto answer Enable or disable conditional forwarding Configure the “Modem” mode Display information from the GSM module Configure the mobile Internet Select the priority of the connection type Configure the operation of the 3G mode Select the type of mobile communication Check the network power Configure regional communication parameters

Wireless interfaces

This section is intended for testing wireless data transmission modules (Wi-Fi, Bluetooth, FM).

Bluetooth. A wide range of settings and tests for the module of the same name in order to check the reception and transmission of data, and start the debugging mode.
CDS Information. Information about the parameters of wireless interfaces.
FM Receiver. Checking the FM module of the device.
Wi-Fi. Testing the module for transmitting and receiving information on the specified frequency channel.
Wi-Fi CTIA. Recording logs of wireless technology tests.

Photo gallery: wireless data transmission

Select the section for checking the device’s wireless modules Check the bluetooth operating mode Find information about the wireless interfaces Configure the FM module Check the operation of the WiFi module Write data about checking the WiFi module to a log file

Audio - fine-tuning audio playback parameters.
Camera - a set of parameters for taking photos and videos that are not included in the Camera application.
Driving Current Camera - takes current readings from the sensor in the camera circuit.
CPU Stress Test - performing tests of all subsystems of the central processor.
Deep Idle Setting - disable sleep mode in standby mode.
Sleep Mode Setting - sleep mode settings.
ChargeBattery - View battery information.
Sensor - sensor calibration.
Multi-Touch - checks the number of available points for simultaneously pressing the screen.
Location Engineer Mode - checking the parameters of the GPS module.

Photo gallery: equipment testing

Go to the section for checking electronic components Adjust the volume of the conversation speakers Adjust the camera's power supply Adjust the standby mode Adjust the frequency of the central processor Adjust the sleep mode View information about the battery Adjust the touch screen Check the capabilities of the multi-touch function Configure the GPS module

Adjusting the speaker volume

In the subsection you can adjust the overall volume level, headphone and speakerphone volume.

You should be careful when changing volume settings. All parameters are individual for a specific device model. Incorrect configuration may result in poor hearing performance.

There are a number of general parameters:

MaxVol - general volume level. The range of values is from 0 to 160. The higher the number, the higher the volume.
Sph - volume during a telephone conversation.
Mic - microphone sensitivity.
Ring - speaker volume for incoming calls.
Media - volume level when watching movies, listening to music and playing games.

Very often, users are unhappy with the speaker volume during a conversation. To improve audibility, go to the Normal Mode menu and change the Sph parameter to 150. If the phone rings quietly when there is an incoming call, then you need to increase the value of the Ring parameter. We advise you not to set the value above 200, as this may damage the speaker. To make you better heard, change the Mic parameter from 100 to 172. This will increase the sensitivity of the speaker.

ROOT is a panacea for a smartphone

On a smartphone without root rights, the functionality of the engineering menu is limited: some items are not displayed, and changes made are not saved. Any interference with the operation of a smartphone requires open access to the system. Don't forget that gaining root access can damage your gadget and will void the device's warranty. We strongly recommend that you back up important information to a memory card and synchronize it with your Google account and remove it to avoid data loss. To unlock full access to the system, you can use one of the existing methods.

Installing the application directly on the device (KingRoot)

Superuser access can be opened from a smartphone using special programs. Let's look at the sequence of operations using the KingRoot program as an example:

After this, you can safely change the parameters in the engineering menu, all changes will be saved. If the result is negative, we move on to the next method.

Obtaining superuser rights via PC (Kingo Root)

This method differs in a slightly larger number of preparatory activities:

The engineering menu is used to configure the device and test the operation of the hardware. This is a built-in system routine that is an indispensable tool for both experienced users and newcomers to the world of mobile devices. However, it should be noted that manipulations with the engineering menu can render the gadget inoperative.

Why you need to root an Android device and what opportunities it provides is known to a fairly large number of users, which cannot be said about the hidden advanced menu of hardware settings, also called the engineering menu. Few people know about these settings, and even fewer mobile device owners know how to use them. What is the Android engineering menu and why is it needed?

The Android engineering menu is nothing more than a special subroutine designed for testing by developers of the operating system and device sensors. The interface of this program is represented by a set of options that allow you to change the hardware configuration of your mobile device. With its help, you can get comprehensive information about the hardware of the gadget, test the processor, RAM and physical flash memory, wireless connection modes, configure the parameters of the camera, display, microphone, speakers and much more.

Entering the engineering menu

All this, of course, is good, but how do you go to the engineering menu if there is no corresponding option in the Android interface? The advanced hardware settings menu is entered using a special code entered in the phone number dialing line. The menu should open immediately after entering the last character of the combination, but in some cases you may need to press the call button.

There is nothing complicated in the procedure itself, however, it should be taken into account that different models of mobile gadgets have their own codes. Below we have provided a list of codes for the most popular manufacturers.

Engineering menu codes in Android are universal, however, their correct operation on phones with “left” firmware is not guaranteed. You can also use special programs to access Android hardware settings, for example, "MTK Engineering Menu" or "Mobileuncle MTK Tools".

Such applications are especially useful on tablets whose firmware does not provide a dialer. The interface and set of available options in these programs are somewhat different, however, understanding them will not be difficult.

Whatever method you use, you need to exercise maximum caution when working with the engineering menu. Before starting work, it is strongly recommended that you write down all the initial parameter values so that you can restore the settings. It is unacceptable to experiment with the engineering menu just to find out what comes out of it, as you can render your device unusable!

To obtain a list of engineering codes for a specific phone model, you can use a special application Secret Codes, available on Google Play. On some mobile device models, full access to the engineering menu may require superuser rights (root).

What you can change using the menu

You know how to get to the engineering menu, now let's find out what settings can be made using it. The possibilities are more than wide. The menu subroutine supports changing the speaker volume level and microphone sensitivity, built-in camera settings, audio parameters, GPS, Bluetooth and Wi-Fi modules, and turning off unused frequencies to save battery power. You can also test key components of your device and external memory card, configure I/O operations, determine the exact temperature of the processor and battery, and the level of harmful electromagnetic radiation.

Another useful function is to gain access to recovery mode - an analogue of BIOS on computers, which in turn contains a whole set of settings. Recovery mode features include resetting the device to factory settings, updating the firmware, creating a backup copy of the operating system, gaining root access, and deleting sensitive user data. It is not possible to list all the engineering menu options in one article; the more sensors and components a phone or tablet has, the more extensive it will be.

Increasing phone volume through the engineering menu

Now let’s demonstrate how to work with hardware settings using the example of one of the most popular operations and learn how to increase the volume on Android through the engineering menu. So, go to the menu using Mobileuncle MTK Tools or by entering the “magic” code, then find and open the Audio subsection. If you entered the menu through the Mobileuncle Tools program, this subsection will be located in the senior section Engineer Mode, in other cases it is usually located on the Hardware Testing tab.

In the Audio subsection you will have the following options:

Normal Mode – normal mode that works when a headset is not connected to the device.
Headset Mode – headset mode that turns on when headphones or speakers are connected to the smartphone.
LoudSpeaker Mode – loudspeaker mode. Activated when the speakerphone is turned on, provided that a headset is not connected to the device.
Headset_LoudSpeaker Mode – loudspeaker mode with a connected headset. The same as the previous one, but with headphones or speakers connected.
Speech Enhancement - this mode is activated when talking on the phone without using the speakerphone.

There may be other settings in the section, for example, Debug Info and Speech Logger, but it is better not to touch them. Select the mode for which you want to change the volume level (let it be Normal Mode), select Type in the list that opens and indicate for which function we will change the volume. The following functions may be available:

Ring – adjust the volume for incoming calls;
Media – adjust the speaker volume when playing multimedia;
Sip – sound settings for Internet calls;
Sph – sound settings of the conversational speaker;
Sph2 – sound settings of the second speaker (the option may not be available);
Mic – change the microphone sensitivity;
FMR – FM radio volume settings;
Sid – it is better not to touch this parameter, otherwise problems with the interlocutor’s voice may occur.

Having selected a function, scroll through the current list, set the desired Value (from 0 to 255) and click to apply the new Set settings.

To change the volume level, you can also use preset templates - the Level option. Most phones have seven levels, from 0 to 6. It is advisable not to touch the Max Vol setting, just as you should not set the Value values too high, otherwise the sound in the speakers will begin to wheeze. Other modes in the Audio subsection are configured in a similar way.

Some smartphone and tablet models require a reboot for the new settings to take effect.

Reset

And the last thing we will look at today is resetting the engineering menu parameters to factory values. It may be needed if, after making changes, the device begins to work incorrectly. There are several reset methods. If the system boots normally, go to the settings and open the “Backup and Reset” subsection.

You can also reset the engineering menu by entering a special service code in the dialer. Usually it is *2767*3855#, *#*#7780#*#* or *#*#7378423#*#*, but your phone model may require a different code.

Another option is to use the recovery mode mentioned above. To get into it, use one of these combinations:

Power button + volume down.
Power button + volume up.
Power button + Home button + Volume down/up.
Power button + volume up + volume down.

In the list of options that opens, select “wipe data/factory reset” → “Yes – delete all user data” → “reboot system now”. The device will reboot and the settings will be reset.

There is another way to reset the engineering menu settings, but it requires superuser rights. Using any file manager that supports root rights, go to the root directory of the system, and then delete all or part of the contents of the folder data/nvram/apcfg/aprdcl and reboot.

Files in a folder aprdcl they are responsible for setting up the engineering menu. It is not necessary to delete all files at once. If you mess up, say, your audio settings, all you need to do to restore the original settings is delete files that have an audio string element in their names. And one moment. Regardless of the reset method, always make a backup of your personal data and applications, as they may all be lost.

The engineering menu on Android devices is a special “built-in” application into the operating system that allows you to fine-tune the device. This is necessary to debug the operation of the hardware and, of course, the software. But often users want to change some settings at their own discretion. In this case, the question arises of how to enter the Android engineering menu. This can be done using special service codes or third-party software.

What options does the engineering menu have?

Settings and menu design on Android devices may vary depending on the phone manufacturer. In general, users resort to using the engineering menu for the following reasons:

Setting up audio on the phone (ringer volume, interlocutor’s voice during a conversation);
Changing camera settings;
Using recovery mode;
Setting microphone sensitivity;
Disabling unused frequencies to save phone battery;
Obtaining information about the device's MAC address;
Setting up Bluetooth and Wi-Fi.

The Android engineering menu provides the user with almost limitless possibilities. But you should always remember that only advanced users can use it. Changing some settings may lead to incorrect operation of your smartphone or tablet. If you don't know what each menu item directly does, simply leave it alone.

The developer mode includes setting up Hardware Testing equipment and also contains the following items:

Audio – volume control in the phone speakers.
Camera – allows you to configure various camera parameters (image size, type, etc.).
Diving current camera shows the current of the camera.
CPU Stress Test performs a test load on the central processor.
De-sense is a device manager that manages configuration parameters.
Display – setting the frequency of the outgoing signal.
IO – setting up input/output operations.
Memory – key information about memory.
Power – information about the battery.
SD Card Test - testing a memory card.
TouchScreen – setting up the touch screen, checking sensitivity.
USB - Tests the operation of the USB port on your phone.

In the Connectivity tab you can get information about devices that work with the outside world. These include Bluetooth, Wi-Fi and FM module. The Log and Debugging tab allows you to view the battery log, set the debugger level and run a special MTK log. In the Others tab you can change fonts, as well as view the temperature of the processor and battery.

How to enter the engineering menu: using code combinations

To enter the engineering menu as quickly and easily as possible, you will need special engineering codes. Each manufacturer has its own combination, which opens access to the engineering menu in Android.

To enter the menu you need to:

In most cases, this technique allows you to open the service menu. Below are some combinations for the most popular phones:

Models from HTC - *#*#3424#*#*, *#*#4636#*#* or *#*#8255#*#*;
Samsung devices - *#*#197328640#*#* or *#*#8255#*#*;
Sony smartphones - *#*#3646633#*#*, *#*#7378423#*#* or *#*#3649547#*#*;
Huawei phones - *#*#2846579#*#* or *#*#14789632#*#*;
Mobile from ZTE - *#*#4636#*#*.

There is also a universal code that is suitable for most smartphones and tablets running on an MTK processor. You can look in the specifications of your device to see what processor you have installed. If this is a MediaTek (MTK) product, then try using the combination *#*#54298#*#* or *#*#3646633#*#*.

If it works, you will see the developer menu in front of you. Some engineering codes for Android do not work in operating versions 4.2.1 and 4.2.2.

What third-party applications can be used to enter the engineering menu

How to enter the engineering menu on Android if the Android codes do not work? There is a way. To enter the engineering menu, you will need one of the applications that will allow you to enter developer mode without entering a combination. There are several similar programs in the official Google Play store. One of them is “Launch the MTK engineering menu”.

To use it, you need:

Go to the Play Market and enter the name of the program in the search bar.
Download and install it.
Launch on your phone.

After that, you will see a couple of tabs with different settings.

The application allows you to perform various tests (for example, a processor stress test), obtain information about the modem or memory, and much more. You can also make changes to the hardware. To do this, you just need to open the appropriate sections and configure the settings. In this case, the phone will be on all the time.

An alternative option is the Mobileuncle tools program. You can download it on the Internet. Install the application, and then go to the “Engineer Mode” submenu. Almost all developer menu items will be available in it.