Modern smartphones are not only about making calls, surfing the Internet and experiencing various games. Devices running Android OS have a fairly large number of different secrets and extensions. Some of them are available in the engineering menu. But what is it? How to enter the engineering menu? Are there any risks in working with this part of the gadget's firmware? Let's start by asking why this menu is not publicly available.
Safety
The fact is that everything that the user has access to, even if mistreated and deleted, will not bring irreparable harm to the smartphone. The same menu, if used incorrectly, can lead to the fact that the gadget will not differ much from a simple tin can, the place of which is in the trash can.
In addition, everything that the user really needs is always in the public domain. Hidden functions are more intended for those who are professionally engaged in software repair of smartphones. By the way, many masters recommend taking a piece of paper and a pen before entering the Android engineering menu. For what? To write down all the stock data, just in case. It helps a lot when something goes wrong.
What is this menu?
The engineering menu means a special program used by developers at the end of the formation of the gadget software platform. It helps at the final stage to change the performance of the device and adjust its various functions at the software level. This menu is also used for testing.
Before using this menu, you should make sure that your smartphone is running on the MediaTech processor. Why is it so important? On other chipsets, for example, Qualcomm, the engineering menu is noticeably curtailed and may be absent altogether. How to enter the Samsung engineering menu is not a question at all, since all devices of this brand work on other types of processors.
Android version
Is there a difference between how to enter the Android 5.1 engineering menu and a younger or older version of the platform? Note that there is a difference even in brands and models of gadgets. As mentioned above, there is no entry to the engineering menu for Samsung, although some argue that the following commands work in this case: * # * # 8255 # * # *, * # 0011 # or * # * # 4636 # * #.
How to open the menu
And now we come to the main question: how to enter the engineering menu? This is possible by entering a special code. This can be done through the dialer. What should I enter?
- *#*#3646633#*#*
- *#*#4636#*#*
- *#15963#*
After entering the command, most smartphones are automatically redirected to the engineering menu. In rare cases, you need to press the call button. If nothing happens after that, check the input is correct. If there is no error, but there is no result either, then the entered code does not suit you.
In the event that you have a tablet that does not have a dialer, or none of the codes worked, you can download a special application from the "Market". For example MTK Engineering or MobileUncle Tools. The apps are free.
Functional
After you managed to enter the engineering menu, you need to find the department for which all the procedures described above were done. There are three options to test and determine any metrics. Let's figure out what's what.
Camera
Let's start with this particular part of the gadget. Almost all camera parameters can be configured through the engineering menu. In another mode, you can turn it on to determine the operating current indicators. Few people are interested in this, but in some cases it helps to solve certain problems associated with auto-correction or focusing.
Audio
Often, the question of how to enter the engineering menu of the phone is of interest to the user precisely because he wants to make his gadget louder. If the manufacturer has not set the maximum settings, you can independently adjust the sound both in the speakers and in the microphone.
These operations can be performed in several separate modes:
- Sip. This item is intended for setting up calls via the Internet according to convenient parameters.
- Mic. In this section, you can change the sensitivity of the microphone to either side, for example, to prevent the microphone from catching breath, and so on.
- Sph. This section is responsible for the hearing speaker. It is recommended to use it if you have difficulty hearing interlocutors calling from different devices, and adjusting the volume rocker does not help out.
- Sph2. Not every smartphone can use this feature, as it is intended for a second hearing speaker.
- Sid. It is better not to change this parameter, since it is almost impossible to adjust it correctly again. He is responsible for the echo effect.
- Media. Use this section if you are not satisfied with the media volume level. Here we are talking about music, video and so on.
- Ring. The name of this parameter speaks for itself - ringtone or the volume of an incoming call.
- FMR - radio sound tuning.
When working in each of the sections, you should understand that playing with each of the parameters is not worth it.
Connections
In the connections section, you can test and correct all possible types of connections that are in the gadget. These include Bluetooth and Wi-Fi. In addition to these obvious types of wireless connections, you can check how well and stable the WLAN CTIA and even the FM receiver are working.
It is curious that in a separate section "Disabling detection" you can adjust the signal frequency.
Display and touch screen
These sections will help you test and set up your smartphone screen and backlight. The first is responsible for backlight correction, control of display lines, and backlight adjustment. By adjusting the sensor, you can test it for broken segments, reaction to touch, and so on. You can also calibrate the sensor through the engineering menu.
Memory and USB
The question of how to enter the engineering menu is also asked by those who are faced with the disappearance of memory on the device. By the way, in a separate section you can test the SD card. As for the memory of the gadget, the menu contains all the information about the module. In the engineering menu, you can test the functionality of the USB port.
Battery
This section is searched by quite a few and are upset when they do not find it. Maybe he is not in the engineering menu? In fact, you can see the status of the battery, the percentage of its deterioration and the rating of the processes that most affect the device, you can in the section "To the extent" and in the "Battery log". The reason for this strange name is the incorrect translation from English. By the way, there is simply no transition from Russian to any other language in the engineering menu.
Qualcomm
As mentioned above, in most devices with such a processor, the engineering menu does not work or is significantly reduced. You can get into it through the usual menu. In it, you need to click on the item several times in a row, which is referred to as the "Kernel version". You will be presented with a new feature that contains five separate items. Which ones?
- Automatic Test. Fully corresponds to its name, it conducts automatic testing of all necessary systems.
- Single Item Test. This section allows you to choose one of 25 tests.
- Test Report. By clicking on this option, you can view the test reports.
- SW add HW version consists of various numbers that display smartphone data.
- Device View. Here is information about the equipment.
Not all smartphones with Qualcomm will display just such a menu, but it's worth a try.
conclusions
Knowing how to enter the Android 4.4 engineering menu and other versions of this operating system, you should understand that if one of the settings causes the gadget to malfunction, the ability to restore it becomes very small. Therefore, as soon as you decide to change something in the settings through the engineering menu, be aware that the life of the device may end there. If something does not suit you in the work of the gadget, it is better to contact an experienced craftsman and describe your wishes in detail. He will be able to soberly assess the possibilities and make a verdict.
For many people, buying a new tablet or smartphone is a real event. Each owner expects that the new gadget will delight him for many years with reliable operation and the absence of problems associated with its operation.
Moreover, in this case, it does not matter who is the assembler of the device and what operating system is installed on it. But it often happens that modern mobile devices can hardly be called ideal.
Some time after the start of use, moments appear that the owner will most likely want to fix in one way or another. Some are trying to finalize the software part of the mobile assistant to a perfect state. It all depends on what is considered ideal. One of the most readily available tools in the Android mobile operating system is the engineering menu.
Android engineering menu: setting secrets
At the final stage of configuring the software shell of a mobile device running on the Android operating system, the developers use the so-called Android engineering menu. The engineering menu refers to the interface of a special program that allows you to make changes to the operation of the device, as well as view information from sensors and perform technological tests. Reckless use of this element can lead to unpredictable consequences. Most often, access to the engineering menu is hidden from users. However, his secret is in fact already known to many. To understand how you can call the engineering menu, you just need to spend a few minutes looking for recommendations.
Important points
Exit to the engineering menu "Android" can not be performed on all mobile devices. In order to take advantage of its capabilities, you need to make sure that the gadget meets a number of requirements. First of all, the central processing unit of the device must be produced by MediaTek. On many inexpensive Spreadtrum models, the popular Snapdragon from Qualcomm and various Tegras from Nvidia and Intel, it is useless to try to launch the engineering menu, since it is missing. You will not be able to get it working even if the corresponding application is provided.
In addition, various modified operating systems, such as the popular CyanogenMod, do not allow the configuration program to run. This is due to the fact that these systems were originally developed for devices with a Qualcomm processor that do not support the Android engineering menu.
It is also desirable that the operating system be original, or at least created on a basic basis. The application file itself must be present among the programs, being hidden from the standard explorer. So, for example, some manufacturers of mobile gadgets, after making the necessary settings for the software part, simply delete the Android engineering menu. In this case, recommendations for using the engineering menu are useless.
Using secret combinations
To get into the settings of the engineering menu in the Android operating system, you can use several methods. Which one is better to say, since a direct comparison would be incorrect. Let's consider each of these methods in turn. One of the oldest options, which was used in the "ancient" models of tablets and smartphones, is that in a special program - a dialer, the user had to dial the engineering menu code. The operation was carried out in the same way as checking the balance on the account. If the device recognizes and accepts the combination, the setup application starts. Some mobile device manufacturers use their own modified code. Therefore, the standard set will not work here. In other situations, to call the engineering menu, you must dial the following combination of characters "* # * # 36 46 63 # * # *". That's all.
The familiar way
The use of a secret combination of signs may not be convenient in all cases. The user may simply forget the correct order of the numbers. In the case of a changed set, it will be easier to use the program instead of finding the correct order of characters. One of the best known applications is Mobile Uncle Tools. This application is distributed free of charge, so the user will not have any problems finding and installing it. At the time of this writing, the current version was 2.9.9 or build 3.1.4, which has additional support for new processors.
For the program to work correctly, the user will first need to get root-rights on their gadget. To obtain root rights, you can use various applications, for example, SuperSu or KingRoot. In this article, we will not talk about the features of working with a rooted device, since this is a separate rather voluminous topic. When the application is launched, you will need to select the third item, which is called Engineer Mode. Next, in the window that opens, you need to select "Work with MTK". When a question about granting root access appears, you need to confirm the operation.
Restoring access to engineering mode
In the event that the manufacturer of the mobile device decides to prudently remove the configuration software in order to ensure the security of the operating system, it will be possible to install it again. To do this, the user will need to find an installer on the Internet that restores EngineerMode.apk. When you find this component, you just have to install it. Due to the abundance of analogous clones, we will not indicate the exact name. You can just copy the specified file to the system folder (system \ app). After completing these operations, you can use any of the following methods to access the engineering menu: you can dial the number or call the menu directly from the program interface. It is worth noting that to perform this operation, the user will need root rights.
Miracle program and its capabilities
Setting up Android through the engineering menu opens up the opportunity for the user to solve several important tasks at once. In particular, here you can adjust the microphone sensitivity and speaker volume, reduce the power consumption, limit the scanning of unnecessary ranges and reduce the search time for satellites. Let's take a closer look at the above functions.
How do I increase the volume?
The volume of the call can be increased quite simply with the help of the engineering menu. To do this, select the "Audio" section. You will see a list of available modes. The Ring subsection of the LoudSpeaker Mode section is responsible for the system speaker in the system. Do not change the value of the parameter in the first window. In the second window, you can set a higher value for the parameter. After completing editing, click on the Set button, which is located here. Next, you need to restart the device, while correctly exiting the program.
Operator frequencies
To optimize the power consumption of your mobile device, you can try disabling the scan for unnecessary frequency bands. The standard frequencies for 2G and 3G networks in our country are 900 and 1800 MHz. A pair of 850 and 1900 MHz is responsible for the American standard. To enable or disable the band you do not need, you need to use the Band Mode item of the engineering menu. Here you need to go to the settings for both SIM cards one by one and put a checkmark in front of the desired items. Pressing the Set button confirms.
How to improve GPS?
To improve the performance of the global positioning system, you must select the Location item in the Android engineering menu. Next, use the Location Based Service item and open EPO. Here you need to make sure that the Download and Enabled items are checked. Then you need to return to the YGPA item, select the information section and click in turn "Full" - "Cold" - "Restart". Then you need to select the item Satelites or "Satellites". Until the answer is recorded on the map. This entire procedure will take 2 to 5 minutes. You just have to exit the engineering menu, close the program and reboot the device.
Not many people know about the existence in the Android OS of the menu with the advanced settings of the device - engineering menu
... And someone knows, but not vkurse how to enter it and what to do with it.
In this article, we will show you how to enter the engineering menu and some of its capabilities.
You can enter the engineering menu simply by writing a special command (but I must add that this method does not work on all versions of Android and not on all devices)
The command to enter the engineering menu: *#*#3646633#*#*
Also, on some versions of Android, the command may work *#15963#* and*#*#4636#*#*
Immediately after entering, the command should disappear and the engineering menu should open. But on some devices, you still need to press the "Call" key
If this method does not work, you can use an alternative one!
And it consists in installing the program (which, by the way, is freely available on Google Play) " Mobileuncle MTK Tools 2.4.0"
This program will open access to the engineering menu (that is, it will work similarly to dialing a combination*#*#3646633#*#*)
There are a lot of settings! The scope for experimentation is huge! You can debug and adjust almost EVERYTHING!
For clarity, let's briefly analyze the volume level setting of the device:
We go into the program ---> select the "Engineer Mode" section
Because we are interested in setting the sound level, select ---> "Audio"
And voila, the menu that interests us opens.
Max Vol - the same for the entire subsection, as a rule, set to 150 (you can change 0-160 - it changes if you select the Media item in the subsection).
If in some submenu, for example, Audio - Normal - Sph, the general level is not available for regulation, then enter another subsection, for example, Audio - Normal - Media - there it will be possible to adjust the overall volume level.
Subparagraphs:
Sph - volume levels during a telephone conversation,
Mic - microphone sensitivity levels,
Ring - the volume of the call,
Media - volume when playing music, movies, games.
Ring volume levels are set in Audio - LoudSpeaker - Ring
Max Vol = 150
Levels: 120 130 145 160 180 200 (more starts wheezing)
Conversation volume levels in the telephone speaker in Audio - Normal - Sph
Max Vol = 150
Levels: 100 120 130 135 140 145 150
Talk volume levels in the microphone in Audio - Normal - Mic
Levels: 100 172 172 172 172 172 172
Media volume levels are set in Audio - LoudSpeaker - Media
Levels: 110 130 160 190 210 230 250
All the same can be configured for the Headphone mode, by analogy:
Speaker volume levels are set in Audio - LoudSpeaker - Sph
Max Vol = 150 (it is the same for the entire section)
Levels: 80 100 110 120 130 140 150 (more starts wheezing)
Now all volumes are adjusted to adequate ranges.
If you are not satisfied with the volume levels, you can set your own values (the higher the value, the higher the volume when adjusting the volume keys, or the greater the microphone sensitivity)
By analogy, you can customize most of the sections! Experiment!
Users of mobile devices often confuse the Android engineering menu with the developers' menu, although the vast majority of users do not know anything and do not even know about its existence.
But those who do not pursue new products and do not buy with each new version of Android, also dream of expanding the capabilities of their device.
In order to solve the problem, you can go in several ways:
Content:
How to enter
The most common call option on an Android device is to enter the combination "* # * # 3646633 # * # *".
Attention! There are a couple of nuances here:
- firstly, after entering the combination, you do not need to press the call button, after a couple of seconds after entering the last asterisk symbol, the required interface will appear on the smartphone screen;
- the method is applicable to most, but not all devices and firmware versions, especially to Chinese devices;
- appearance and the functions provided on different devices may differ (number of categories, names, differences in versions, etc.).
On other models, try entering *#*#4636#*#* or *#15963#* ... The combinations for mobile devices from the most popular manufacturers are shown in the table below.
| Samsung | [*#*#4636#*#*] [*#*#8255#*#*] |
| Lg | [*#546368#*818#] |
| Sony | [*#*#7378423#*#*] |
| Huawei | [*#*#2846579#*#*] [*#*#2846579159#*#*] |
| Acer | [*#*#2237332846633#*#*] |
| Htc | [*#*#3424#*#*] [*#*#4636#*#*] [*#*#8255#*#*] |
| Fly philips alcatel | [*#*#3646633#*#*] |
If you can't call
It is very rare, but it may be that none of the given combinations led to the call of the required window. In this case, download the Mobileuncle MTK Tools application (removed from).
It works similarly to the methods described above, with the difference that it sends commands for entering codes to the mobile operating system automatically, determining its version and model of the gadget after calling the “Engineer Mode” command.
Before using the program, it is strongly recommended, it is not for nothing that it was removed from the application store - many dozens of users “killed” the firmware of their devices due to inept and careless handling of the software.
In addition to calling options, the program allows you to:
Extended interface composition
Engineer Mode for the user is presented in the form of a multi-tab window, where certain types of functions are collected on each of the tabs.
Telephony
The first tab contains functions for performing general phone settings: testing the network and obtaining information about the network technologies used, changing the GPRS parameters, configuring the camera and a lot of sub-items that are incomprehensible to a beginner.
Connectivity
Responsible for changing parameters and displaying information about ports for communication:
You can request comprehensive information about each module, test its operation, change the configuration and browse through the logs.
Hardware Testing
The title of the section indicates that there are tools for working with hardware: testing it, extracting any information about hardware components, changing their operating modes.
On Android, it supports more than a dozen audio playback modes for various conditions (, call,).
As for the camera, a huge range of parameters are available here, which include changing the preview of clips and specifying the default video frame rate and many other items.
To check the stability and through it, you can run a processor stress test.
Changing its voltage and operating frequency in order to overclock or save the battery should be extremely careful and aware of the possible risks.
The processor has the option of putting it into sleep mode under certain conditions, as well as turning off the display.
Also, Engineer Mode contains a huge number of items for retrieving information and debugging the operation of the processor, touch display, sensors.
There are functions for stopping and changing the operating mode.
Location
For those who like to use the GPS capabilities, who sometimes lack its settings, an abundance of items is available in this tab.
Log & Debugging
Logs and files with information about the modes for the battery, memory and a large number of settings to exclude unnecessary information from the logs, change the directory of their storage.
Other
The last tab has collected everything that did not find a place in the previous ones. This (changing the size, size) and several functions inaccessible without root-privileges.
A beginner who has bought a smartphone or tablet based on the Android operating system, after a while, feels the need to reconfigure or adjust more precisely. It's easy to enter the Android engineering menu: just know the special commands.
The hidden engineering menu in Android devices allows you to manage the system settings of a smartphone or tablet, which are not available in the standard menu. For example, they allow you to increase the speaker volume when making calls, forcibly select the frequency range of the network used, enable a photo or video format that is not in the main camera settings, etc.
Parameters configurable in the engineering menu
Using the engineering menu, you can access such functions as:
- speaker or headphone volume;
- improved speech recognition;
- microphone sensitivity;
- the quality of voice transmission when making calls;
- forced mode of selecting a cellular network: "only GSM", "only WCDMA", "only LTE" (in the standard settings of some network modes may not be available);
- binding to one base station, frequency or channel number;
- choice of technology and speed of cellular data;
- testing and "overclocking" the processor;
- enable / disable "sleep" mode;
- testing of radio modules Wi-Fi, Bluetooth;
- auto-switching 2G / 3G / 4G in "sleep" mode;
- camera test drive;
- changing the format of photographs (by default, it is JPEG or PNG);
- fine-tuning the brightness of the display and its response to illumination;
- lock / unlock auto answer settings for an incoming call;
- improved GPS performance;
- full "reset", including factory formatting of the smartphone;
- testing and adjusting motion sensors;
- testing color rendering on the display;
- testing and setting up a vibrating alert;
- backup of multimedia files;
- determination of the level of harmful radiation (SAR) on a single device;
- FM radio settings and behavior.
Video: the ability to customize a smartphone through the engineering menu
Commands for accessing the menu
The commands for accessing the engineering menu differ depending on the manufacturer. There are also general commands for all versions of Android that allow you to customize individual device functions.
The main codes for entering the engineering menu
The commands you enter are different for different brands of devices - choose the one that works. 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
Commands provided by Google for Android OS
Android factory service codes that display technical information about a device are often not vendor-specific. Basically, they are all built into Android by default. The range of command "numbering" has been agreed by Google - as the creator of the Android operating system - with the manufacturers of tablets and smartphones.
Table: Android Factory Service Codes
| Parameter opened with a set of code | Dialing code |
| Wi-Fi MAC address | *#*#232338#*#* |
| Active WLAN Information | *#*#232339#*#* |
| GPS check | *#*#1472365#*#*, *#*#1575#*#* |
| Bluetooth version | *#*#232331#*#* |
| Bluetooth MAC address | *#*#232337#*# |
| Loopback Batch Tests | *#*#0283#*#* |
| Touchscreen version | * # * # 2663 # * # * (test * # * # 2664 # * # *) |
| Checking the motion sensor | *#*#0588#*#* |
| Screen check | *#*#0*#*#* |
| Vibrating alert and backlight test | *#*#0842#*#* |
| Melody test | *#*#0673#*#* |
| RAM version | *#*#3264#*#* |
The most demanded 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 serial number of IMEI | *#06# |
| Settings and information | *#*#4636#*#* |
| Android OS version | *#2222# |
| Erasing all SMS messages | #*5376# |
| Smartphone and battery usage statistics | *#*#4636#*#* |
| Reset your Google Account and other system utilities without removing the pre-installed software. This will leave applications stored on the memory card (SD) unchanged. | *#*#7780#*#* |
| Resetting the settings and clearing user files from the internal memory, reinstalling the smartphone's firmware. You are not prompted for confirmation, but you can remove the battery in time - and then restore the files and settings from the backup using the application on your computer. | *2767*3855# |
| Information about the built-in camera and its settings. Updating the firmware. | *#*#34971539#*#* |
| Change the mode of action of the "End" button ("On / Off"). | **#*#7594#*#* |
| Shows the screen for copying files. You can back up all your data. | *#*#273283*255*663282*#*#* |
| Service mode - launch all kinds of checks (click on Menu), reconfigure the smartphone in service mode. | *#*#197328640#*#* |
Consider the following when using the commands:
- by updating the camera's 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 once again - in case of failure, you will simply ruin it;
- When you reset the Android system and delete all Google user data, a message will appear prompting you to confirm the reset.
How to enter the engineering menu
To get to the engineering menu, follow the steps below.
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 devices is suitable - by this the manufacturer protects inexperienced users from not fully thought out actions. Some manufacturers, after software debugging of the smartphone, completely remove the engineering menu, and all the above commands simply do not work. For example, this is what Samsung does. 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 get Root access on Android. There are other applications too: 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 of the sections of the engineering menu, use the on-screen "Back" key either in the menu itself, or press the call cancel button or the "Back" key under the display - it is denoted as an arrow with a turn - 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 restart the smartphone by pressing the power button, remove the battery from the device, etc. Exiting the engineering menu may consist in pressing - sometimes with holding for a few seconds - the same "Back" key that is under the display. When you exit the engineering menu, a message will appear on the smartphone screen asking you to save the settings made - confirm it. There are tips for some of the sections of the engineering menu:
The reason why the engineering menu still does not save the settings may be the "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 preinstalled 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 can do.
In some cases, it is impossible to enter the engineering menu without obtaining Root rights. The task is to make a smartphone with Android "rooted". In other words, to get on a smartphone the capabilities of a "superuser", 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 opens access not only to the engineering menu, but also to the system folder.
- Download any of the Android jailbreak apps from the Android Market without the need for a computer. Different programs are suitable here: Universal AndRoot, Unlock Root, z4root, Revolutionary, etc. Not all of them can help - you have to test everything until it works.
- You can also try Windows applications that do all the manipulations with Root access on a smartphone directly from a PC - for example, the VRoot program. You also need a USB-microUSB cable - it's impossible to hack Android on a smartphone via Wi-Fi.
After obtaining Root privileges, the smartphone is ready to activate the engineering menu using third-party Android applications.
The "fresher" 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 brand and model of the smartphone. Try different combinations and programs, but don't get too carried away.
In case of inept actions or forgetfulness of the entered codes, there is a risk of turning the smartphone into a lifeless device, and only in the service center they will be able to restore it. And since in the case of "rooting" the device, you automatically void 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 subordinating your smartphone or tablet to yourself, you will deprive it of the opportunity to “live its own life” not according to your schedule, but according to the scenario of the manufacturer itself, cellular operators and other intermediary companies, one way or another involved in the operation of mobile technology in cellular networks. This is the shortest path to professionalism.
