Enter engineering mode. Engineering menu of Huawei smartphones

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 cause your smartphone or tablet to not work correctly. 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 – adjusts the volume 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.

Manufacturers of Android smartphones implement and use the engineering menu to test devices. It contains all kinds of tests and device settings that are not available to ordinary users. However, today, knowing the USSD command or downloading the application from PlayMarket, anyone can go to the engineering menu.

Why do you need a hidden engineering menu in Android?

Engineering Menu (Engineering Mode) is essentially a hidden application that developers use to test and set the optimal parameters of a mobile phone or tablet. Specialists check the operation of the sensors and, if necessary, make adjustments to the functioning of system components.

When working with the Android technical menu, be careful - changing some functions leads to malfunctions of the device.

How to enter the menu

To open the menu installed by the manufacturer, activate the dial pad on your smartphone and enter one of the USSD commands presented in the table. After entering the command, the numbers will disappear from the screen, and a menu will open instead.

In the dial pad, enter a combination of numbers and symbols to enter the menu

Table: combinations for launching Engineering Mode

Device manufacturer	Team
Sony	##7378423##
	##3646633##
	##3649547##
Philips	##3338613##
Philips	##13411##
ZTE, Motorola	##4636##
HTC	##3424##
	##4636##
	##8255##
Samsung	##197328640##
	##4636##
	##8255##
Prestigio	##3646633##
LG	3845#*855#
Huawei	##2846579##
Huawei	##14789632##
Alcatel, Fly, Texet	##3646633##
Smartphones and tablets with a MediaTek processor (most Chinese devices)	##54298##
	##3646633##
Acer	##2237332846633##

Video: how to work in Engineer Mode

If the code does not work and you cannot launch the service menu using the standard method, use third-party applications - you can download them on PlayMarket. Recommended programs - “Launch the MTK engineering menu”, Mobileuncle Tools, Shortcut Master.

The manufacturer menu does not work on some device models with Android 4.2 JellyBean (x.x.1, x.x.2), as well as on Android 5.1 Lollipop. The menu is also invalid when the Cyanogen Mod firmware is installed. In Android 4.4.2, when you reboot, changes made in the application are reset.

“Launch the MTK engineering menu”

The application allows you to open and configure the engineering menu without typing digital commands. Works correctly on MediaTek processors (MT6577, MT6589, etc.) and Android systems 2.x, 3.x, 4.x, 5.x. According to user reviews, the program successfully performs its functions, but after rebooting the smartphone, the settings made using the application are reset.

Mobileuncle Tools program

The functionality of the application is similar to the previous one, but, in addition to accessing the engineering menu, the user has the opportunity to view information about the screen, sensor and device memory, as well as update the firmware, restore the IMEI number and improve GPS. For stable operation, root rights are required.

To enter the engineering menu, select Engineer Mode

Shortcut Master utility

The Shortcut Master program is designed to work with shortcuts and system applications: creating, searching, deleting. It does not have a direct function for entering the engineering menu. But with its help you can view the list of secret commands operating on your device. And by clicking on the name of the command, you will see a drop-down menu in which there will be an item “execute”. Convenient and does not require unnecessary actions.

In the program, call up the additional menu and select Secret code explorer to see a list of codes

Root rights to access the engineering menu

To get to the service menu on some versions of Android, the user must have superuser rights (root). You can obtain rights using specialized applications: Farmaroot, UniversalAndRoot, Romaster SU and others. To get Root access to your device using Farmaroot:

Install and run the program. Link to Google Play: https://play.google.com/store/apps/details?id=com.farmaapps.filemanager&hl=ru.
If the application supports installing root rights on your device, then on the screen you will see a list of possible actions, among them - “Get root”. Select this item.
Choose one of the preset root methods.
The program will begin installation.
At the end of the procedure, you will see a message about the successful installation of root access.

Instructions for obtaining root access through the Farmaroot application

Possible problems and solutions:

the application closed mid-installation - restart the device and try again;
root rights are not installed - try installing using a different method (select a new exploit in the application).

What can be configured in the menu

The appearance of the engineering mode and the ability to adjust parameters may vary depending on the tablet or smartphone model. In the menu, users most often adjust the sound, change the camera settings and use the recovery mode. The parameters for adjustment and the procedure are given below. Be careful - the names of menu items may differ in different device models! You act at your own risk.

Audio: Increase volume level

If your phone does not ring loudly enough, find the Audio section in the engineering menu and go to LoudSpeaker Mode. Select Ring. For each signal level (level 1–6), change the values - set the numbers in ascending order, from 120 to 200. Increase the value in the Max item. Vol - maximum 200. Press the SET button to save the settings.

Sequentially change the maximum volume values for each level

Audio: Increase phone call volume

To enhance the speaker tone for conversations, in the Audio service menu section, select Normal mode and open the Sph item. Set the values for signal levels (level 1–6) from 100 to 150, and the number for Max. Vol. – up to 160.

By adjusting the speaker volume, you will be able to hear your interlocutor better during a call.

To increase the sensitivity of the microphone, go to the menu Audio - Normal mode - Mic. For each level, assign the same microphone sensitivity values, for example, 200. Press the SET button, reboot and check whether the other party can hear you better.

Increased microphone sensitivity will allow the other person to hear you better

Video: adjusting sound parameters in the engineering menu

Battery: Disable unused frequencies

Smartphones quickly drain battery life running applications, maintaining cellular communications, and network connections. Using the engineering menu you can increase the battery life.

Modern devices scan several GSM frequencies - 900/1800 MHz and 850/1900 MHz. In Russia there is a pair of 900/1800 MHz, which means there is no need to scan the network at other frequencies. The radio signal for the second pair can be turned off, which will significantly save the charge level.

In Engineer Mode, open Band Mode. Disable unused frequencies by unchecking the corresponding items - PCS1900 and GSM850. If the device supports two SIM cards, open the SIM1 and SIM2 items one by one and perform the indicated steps in each. Press the SET button to save the settings.

Disabled frequencies save battery power

If your smartphone and SIM card operate in 3G networks, disable the networks that are not used in Russia: WCDMA-PCS 1900, WCDMA-800, WCDMA-CLR-850. Press the SET button again.

You can enable scanning of disabled networks by returning to the same menu and checking the boxes.

Camera: photo and video settings

By default, Android devices save pictures in JPEG format. Meanwhile, photographers prefer to shoot and process material in RAW to gain more editing options. The technical menu allows you to select the desired image format.

Find Camera in the menu and select Capture Type. Set the photo format to RAW and press SET. Also in the Camera menu you can increase the size of pictures, set the ISO value, enable shooting in HDR for higher photo detail, and set the frame rate for videos. After changing each parameter, remember to press SET to save the settings.

Recovery Mode

Recovery Mode is an analogue of Bios on a computer, it allows you to manage the device without logging into the Android system. Recovery mode features:

resetting settings to standard;
firmware update;
access to root rights;
creating a backup copy of the OS;
removal of personal data from the system.

In Recovery Mode, do not perform an action if you are not sure what it will lead to. Some commands may harm the device and system.

If the settings are not saved

Users who have access to the technical menu complain that the parameters changed in it are not activated or are reset when the device is restarted.

To activate the settings after changing parameters, tap on the SET button at the bottom of the screen. If the parameters are reset after rebooting the device, try accessing the technical menu not through the application, but using a digital command.

After setting the settings, do not forget to press the SET button

Service codes for Android devices

In addition to the technical menu, secret USSD codes - combinations of numbers and symbols, which the user types by typing to perform an action, allow you to control the functionality of Android smartphones. Secret codes for different devices are given in the table.

Table: list of secret commands for Android

Manufacturer	Digital Team	Meaning
Codes for most manufacturers	##7780##	Rolling back settings and uninstalling user applications
	27673855#	Firmware change, total settings rollback.
	##232339## ##526##	Checking wireless connections
	##34971539##	Camera details
	##232338##	View Wi-fi address
	##273283255663282##*	Activating media backup on your phone
	##1472365##	Express GPS test
	##0##*	Checking the screen
	##2663##	Viewing touchscreen information
	##2664##	Touchscreen testing
	##4636##	General device and battery data
	##0673## ##0289##	Audio tests
	##7262626##	Checking GSM reception
	##0842##	Vibration and display brightness test
	##3264##	RAM information
	##232331##	Testing Bluetooth Communications
	##8255##	Checking Google Talk
	##232337##	Bluetooth address information
	##1234##	Device firmware data
	##44336##	Device build date
	*#06#	IMEI number information
	##197328640##	Service activity test
	##1111##	Free-to-air version of programs
	##2222##	Iron number for free-to-air
	##0588##	Checking the proximity sensor
Sony (devices use the same commands)	05*#	Unblocking a PUK code
Motorola	*#06#	IMEI
	##786##	Reverting settings to original
	##1234## ##7873778##	Opening applications with root rights
	##2432546##	Checking for updates
	##2486##	Entering the service menu
HTC	##4636##	Service menu
	##3282#	EPST System Application
	##8255##	G-talk monitor
	##33284#	Network status
	##3424##	Functionality test
	##3424#	Device diagnostics
	##7738#	Protocol diagnostics
	##8626337#	Voice Coder
Samsung (generic codes are effective)	##778 (+call)	Activation of EPST menu
LG (working with codes is replaced by the technical menu)	3845#*855#	International devices
	3845#*400#	Chinese devices
	5689#*990#	Sprint
	##228378 (+ call)	Verizon Wireless
	3845#*851#	T-Mobile
	3845#*850#	AT&T

If for some reason the service code did not work, do not worry - install and run the Secret Codes application (Link on Google Play: https://play.google.com/store/apps/details?id=fr.simon.marquis. secretcodes&hl=ru). The program will analyze the combinations active in the device and offer you a list. You can activate the combination directly in the application with one click on the name.

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Almost all smartphones from Meizu are powered by processors from MediaTek, which means that gadgets with such a chipset always have the Meizu engineering menu. Today we will tell you how to get there, what it is needed for and how any owner of a Meizu gadget can use it to their advantage.

You probably already understood from the name that this menu was created in order to configure, test and debug various phone modules. Since it is mainly used for the latter purpose, the average user will not be interested in digging into at least half of these functions. In addition, we urge you to be careful: if you do not know what exactly you are doing, then it is better not to mess with this setting, as there is a risk of disabling important parameters of the device or even turning it into a “brick”.

To log in, you need to open the dialing menu on Meizu and dial a special code: *#*#3646633#*#*. True, it doesn't always work. If nothing happens, try entering *#*#4636#*#* or *#15963#*. If everything is done correctly, you will see the Engeneer Mode program with a slightly strange design - this is the same engineering menu.

If for some reason not a single code worked, then to enter the section we need, use the specialized program “MTK Engineering Mode” or another similar one. To do this, you will need to go to the Play Market or App Store and download it. Once it is installed, launch the application and complete all the necessary steps. As a result, you will be able to configure the phone through the engineering menu by going to certain sections of it.

Engineering menu functionality

There are several hundred different settings hidden here, which are divided into six large tabs:

Telephony – view and check the parameters of the phone’s mobile network, set automatic answering of an incoming call, check the compatibility of the smartphone with a specific mobile operator, disable support for bands, and it is also possible to reset all settings to factory settings;
Connectivity – checking Wi-Fi and Bluetooth module, function to turn off the display while using Wi-Fi Display and much more;
Module testing (Hardware Testing) – test the sound volume through the headset, increase it, check the screen and other important sensors and modules of the Meizu gadget;

Location – all the same actions, but related to location verification: disabling A-GPS detection and others;
Debugging (Log & Debugging) – here, for the most part, various links to utilities and tests from MediaTek and those companies that supply other components to the smartphone are stored;
Others – other settings and tests, for example, setting font sizes on the phone.

It would also be useful to clarify that setting up the phone through the engineering menu on new Meizu models will be carried out a little differently due to the different structure of the menu items, however, the general meaning remains the same, and therefore it will not be difficult for a knowledgeable person to configure it. Meizu service codes for entering the menu may differ slightly from what was indicated in the previous paragraph, but usually it is the same.

How to increase the sound in headphones to full volume?

A little instruction on how to turn the music volume up to maximum:

In the Hardware Testing section, select Audio -> Headset Mode.
Value Max Speaker Vol. set to 160 (maximum volume) and press Set.
Audio -> Headset_LoudSpeaker Mode in the Max Headset field, enter the value 160, apply by clicking Set.

Conclusion

As you can see, the Meizu engineering menu contains many options for fine-tuning your smartphone to suit your personal needs, from sound testing to controlling the radio module and GPS. In any case, an experienced user will be able to find something interesting for themselves, but an inexperienced user better be more careful with these settings - you can make a mess.

The engineering menu is implemented and used by manufacturers of Android smartphones to test and configure various functions. This menu is hidden in the operating system shell and is called only by a special USSD command, or through third-party applications. On this page I will post information on how to enter the engineering menu and what data can be changed by the smartphone user.

What is the engineering menu in Android?

Engineering menu (Engineering Mode) is a hidden program in every Android device that allows you to manage the settings of your gadget. In essence, it resembles the main data processing center in a smartphone. With its help, manufacturers and developers check the operation of hardware parts and sensors and make adjustments.

Warning! When using the engineering menu, be careful when making changes. Rash and negligent actions can lead to malfunctions of the smartphone.

How to enter the engineering menu?

To open it, launch the Phone application, go to dial the number and use one of the USSD commands presented in the table below. Once you have completed typing numbers and symbols, the desired menu will open.

Important! The menu does not work on all Android smartphones! In most cases, these are devices with Android 4.2 and smartphones based on Android 5.1. Access to the engineering menu in the Cyanogen Mod firmware is completely blocked. Also, on many devices with Qualcomm Snapdragon, Intel or Tegra processors, access to the menu via the USSD command is disabled.

USSD command table

The most common login code is *#*#3646633#*#*. Also, in the table you will find other teams from popular manufacturers: Samsung, Xiaomi, Meizu, Sony, ZTE, HTC, LG, Huawei, Lenovo and others.

Advice! Some smartphones running Android version 4.4.2 reset changes made in the engineering menu after a reboot.

As an alternative, devices with a Qualcomm Snapdragon processor have access to the login, which opens by repeatedly clicking on “Build Number”.

Third party application

For devices with MediaTek processors, you can use third-party applications, of which there are plenty in the play market. For example . But on gadgets with other processors, the application will not work!

Also, some devices will not respond to changes or save settings made by the program until they are installed.

What can you find out and configure?

Here you can find useful information, test smartphone parameters and change and configure device functions.

You can watch:

- an identifier that is present in every gadget.
The smartphone number is sometimes not specified.
Network - information about the operator.
Roaming - whether you are in it now or not.
Network information - whether there is service, enabled or not.
Call forwarding - whether used or not.
Network type and index.
Ring tone volume.
Your location in the form of coordinates - with GPS turned on.

The "About the Battery" section provides information:

state (charging or not);
charge level (indicated as a percentage);
elapsed time since last download;
battery temperature and voltage;

Other sections help you find out information about applications - name, date of last launch, operating time. It is possible to view Wi-Fi data - connection status, data transfer speed, network name, etc.

Tests are also available to identify the problem area in the gadget:

Automatic Test - tests every parameter in the device.
Report - displays a report on the test performed.
Screen test - checking sensitivity, brightness.
Camera test - checking the flashlight, flash.
Test of sensors and adapters - information on testing the accelerometer, gyroscope, etc.
Test of connectors, vibration, speakers, mechanical buttons, SD cards and SIM.

Important! In Android devices, the presence of this or that information in the engineering menu may differ. In one case, there will be more parameters, data and functions than indicated in the article, in the other - only brief information.

You can configure the following parameters (change them thoughtfully and with caution):

Cellular communications (Telephony)- withdrawal of frequencies on which the operator does not work in order to save battery energy consumption (Band Mode section), as well as set the priority of 2G, 3G, 4G networks (Network Selecting section). Here you can also configure GPRS and IMEI.
Connectivity- changes to Wi-Fi and Bluetooth adapters.
Sound volume (Audio)- decreasing or increasing the maximum sound volume threshold of the speaker, headphones, speakerphone.
Camera- change the image format from .jpeg to .raw, set the image size, enable HDR shooting, change the video frame rate.
R Recovery Mode- , firmware update, access to Root rights, creating a backup ().

Also, there are secret commands for android, which allow you to perform one or another engineering menu operation using a USSD code.

A beginner who buys a smartphone or tablet based on the Android operating system, after a while, feels the need to reconfigure something in it or adjust it more precisely. Entering the Android engineering menu is simple: you just need to know the special commands.

The hidden engineering menu in Android devices allows you to manage system settings of your smartphone or tablet that are not available in the standard menu. For example, they allow you to increase the speaker volume during calls, forcefully select the frequency range of the network being used, enable a photo or video format that is not in the main camera settings, etc.

Parameters configured in the engineering menu

Using the engineering menu you can access functions such as:

speaker or headphone volume;
improved speech recognition;
microphone sensitivity;
voice quality when making calls;
forced cellular network selection mode: “GSM only”, “WCDMA only”, “LTE only” (some network modes may not be available in the standard settings);
binding to one base station, frequency or channel number;
choice of technology and cellular data speed;
testing and overclocking the processor;
enable/disable sleep mode;
testing Wi-Fi and Bluetooth radio modules;
auto switching 2G/3G/4G in sleep mode;
camera test drive;
changing the photo format (default is JPEG or PNG);
fine-tuning the display brightness and its response to illumination;
locking/unlocking auto answer settings for incoming calls;
improved GPS performance;
full “reset”, including factory formatting of the smartphone;
testing and setting motion sensors;
testing color rendering on the display;
testing and setting up vibration alerts;
backup of multimedia files;
determination of the level of harmful radiation (SAR) on a single device;
FM radio settings and behavior.

Video: options for customizing a smartphone through the engineering menu

Commands for accessing menus

Commands for accessing the engineering menu vary depending on the manufacturer. There are also common commands for all versions of Android that allow you to configure individual device functions.

Main codes for entering the engineering menu

The commands you enter vary for different brands of devices - select the ones that suit you. It is not forbidden to check everything - commands that do not correspond to a specific manufacturer simply will not work.

Table: commands for accessing the engineering menu of various manufacturers

Google Commands for Android OS

Factory Android service codes, which show technical information about the device, are often not associated with the manufacturer. Basically, they are all built into Android by default. The range of “numbering” of commands has been agreed upon by Google - as the creator of the Android operating system - with manufacturers of tablets and smartphones.

Table: Android factory service codes

Parameter opened by typing code	Code to be dialed
Wi-Fi MAC address	##232338##
Information about the active WLAN network	##232339##
GPS check	##1472365##, ##1575##
Bluetooth version	##232331##
Bluetooth MAC address	##232337#*#
Loopback Batch Tests	##0283##
Touch screen version	##2663## (test ##2664##)
Checking the motion sensor	##0588##
Checking the screen	##0##*
Checking the vibration alert and backlight	##0842##
Melody test	##0673##
RAM version	##3264##

The most popular service codes of the engineering menu

The most popular codes that allow you to change smartphone settings through the engineering menu do not depend on the phone brand or Android version.

Table: service codes for changing phone settings

Called parameter or setting	Service code
Find out the IMEI serial number	*#06#
Settings and information	##4636##
Android OS version	*#2222#
Erase all SMS messages	#*5376#
Smartphone and battery usage statistics	##4636##
Reset Google account settings and other system utilities without removing pre-installed software. However, applications stored on the memory card (SD) will remain unchanged.	##7780##
Reset settings and clear user files from internal memory, reinstall smartphone firmware. There is no confirmation prompt, but you can have time to remove the battery - and then restore files and settings from a backup using an application on your computer.	27673855#
Information about the built-in camera and its settings. Firmware update.	##34971539##
Changing the mode of operation of the “End Call” button (“On/Off”).	*##7594##
Show the file copying screen. You can back up all your data.	##273283255663282##*
Service mode - launching all kinds of checks (click on Menu), reconfiguring the smartphone in service mode.	##197328640##

When using commands, keep the following in mind:

By updating the camera firmware through the engineering menu, you can find out about the version of this firmware and the number of its updates - and also save this update to an image in the internal memory and on the SD card. It is not recommended to reflash the camera again - if it fails, you will simply ruin it;
When you reset your Android system and delete all Google user data, a message asking you to confirm the reset will appear on the screen.

How to enter the engineering menu

To get to the engineering menu, follow these steps.

Video: how to open the engineering menu on Android

What to do if you can’t enter the menu

It happens that none of the commands intended for a particular brand of device are suitable - this is how the manufacturer protects inexperienced users from not fully thought-out actions. Some manufacturers, after software debugging of a smartphone, completely remove the engineering menu, and all of the above commands simply do not work. For example, Samsung does this. Some of the commands entered can harm both the Android software and the device itself.

Often, instead of general service commands, more specific ones are triggered. If, despite all your attempts to “reach out” to the engineering menu, none of the service codes work, you need special applications.

Install the free Mobileuncle Tools application - it will distinguish between hardware and system settings. You may need to obtain Root access on Android. There are other applications: EngModeMtkShortcut, BetterCut, etc.

How to save settings

In order for the settings made using the Android engineering menu to be saved, you need to exit it correctly. While in any section of the engineering menu, use the on-screen “Back” key either in the menu itself, or press the cancel call button or the “Back” key under the display - it is indicated as a reversal arrow - to go to a higher level of the engineering menu.

It is not recommended to set the value of any setting and confirm it with the Set key, turn off or reboot the smartphone by pressing the power button, remove the battery from the device, etc. Exiting the engineering menu can involve pressing - sometimes holding for a few seconds - the same “Back” key below the display. When you exit the engineering menu, a message will appear on the smartphone screen asking you to save the settings you have made - confirm it. There are tips on some of the sections of the engineering menu:

The reason why the engineering menu still does not save the settings may be “raw” firmware. Find out which Android versions and builds are right for your device. If you have a branded smartphone with a version of Android that has pre-installed programs and components from Beeline, MTS, MegaFon or Tele2, feel free to install a “custom” version, for example, the well-known CyanogenMod assembly. Any earlier - or, conversely, the most recent - version of Android may be suitable.

In some cases, it is impossible to enter the engineering menu without obtaining Root rights. The task is to make an Android smartphone “rooted”. In other words, get “superuser” capabilities on your smartphone, allowing you to take the smartphone under the clearest and most complete control. This is achieved in the following ways, use any of them.

Install a custom (modified) version of Android on your smartphone. It already includes the Superuser software component, which provides access not only to the engineering menu, but also to the system folder.
Download from the Android Market any of the apps that can hack Android without using a computer. Different programs are suitable here: Universal AndRoot, Unlock Root, z4root, Revolutionary, etc. Not all of them can help - you will have to test everything until it works.
You can also try applications for Windows that perform all manipulations with Root access on a smartphone directly from the PC - for example, the VRoot program. You also need a USB-microUSB cable - it is impossible to hack Android on a smartphone via Wi-Fi.

After receiving Root privileges, the smartphone is ready to activate the engineering menu using third-party Android applications.

The more recent the version, the more settings in the engineering menu will be in Russian. In the earliest versions of Android (1.x, 2.x), all service settings were in English. Having learned a little technical English, you can easily remember the purpose of each of the settings and, if necessary, you can change them all in a few minutes.

The availability of the engineering menu - in whole or in part - is decided not by the Android version, but by the make and model of the smartphone. Try different combinations and programs, but don't get too carried away.

If you perform inept actions or forget the entered codes, there is a risk of turning your smartphone into a lifeless device, and only a service center will be able to restore it to you. And since if you “root” the device, you automatically lose the warranty.

The Android engineering menu is one of the most useful tools for an “advanced” user, preventing him from wasting the hardware resource of his device and the resource of cellular and wireless networks. And it doesn’t matter what version of Android you have - 2.2, 4.2.2, 4.4.2 KitKat, 5.1, 6.0 or another - the engineering menu codes are determined only by the manufacturer. By completely subjugating your smartphone or tablet, you will deprive it of the opportunity to “live its own life” not according to your schedule, but according to the script of the manufacturer itself, cellular operators and other intermediary companies that are in one way or another involved in the operation of mobile equipment in cellular networks. This is the shortest path to professionalism.