How to enter the service menu on Android. How to enter the Android engineering menu
For many people, buying a new tablet or smartphone is a real event. Every owner expects that a 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 assembles 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, issues appear that the owner will probably want to correct in one way or another. Some are trying to improve the software part of the mobile assistant to an ideal state. It all depends on what is considered ideal. One of the most accessible tools in the Android mobile operating system is the engineering menu.
Android engineering menu: configuration secrets
At the final stage of configuring the software shell of a mobile device running on the Android operating system, 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. Careless use of this element can lead to unpredictable consequences. Most often, access to the engineering menu is hidden from users. However, his secret is essentially already known to many. To understand how to call up the engineering menu, you just need to spend a few minutes searching for recommendations.
Important points
Exiting to the Android engineering menu may not be possible 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 device's central processor must be manufactured by MediaTek. On many inexpensive Spreadtrum models, popular Snapdragon from Qualcomm and various Tegra Nvidia and Intel, it is useless to try to launch the engineering menu, since it is missing. You will not be able to achieve functionality 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, hidden from the standard Explorer. So, for example, some manufacturers of mobile gadgets, after making the necessary software settings, simply delete the Android engineering menu. In this case, recommendations for using the engineering menu are useless.
Using secret combinations
To get to the engineering menu settings in the Android operating system, you can use several methods. It is impossible to say which one is better, since a direct comparison would be incorrect. Let's look at each of these methods in turn. One of the oldest options, which was used in “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 similarly to checking the account balance. If the device recognizes and accepts the combination, the setup application launches. 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 need to dial the following combination of characters “*#*# 36 46 63#*#*”. That's all.
The usual way
Using a secret combination of characters may not be convenient in all cases. The user may simply forget the correct order of numbers. In the case of a changed set, it will be easier to use the program instead of finding the correct order of the characters. One of the most famous applications is Mobile Uncle Tools. This application is distributed free of charge, so the user will not have problems finding and installing it. At the time of writing this article, 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 obtain root rights on his gadget. To obtain root rights, you can use various applications, for example, SuperSu or KingRoot. This article will not talk about the specifics of working with a rooted device, since this is a separate, rather extensive topic. When the application is launched, you will need to select the third option, which is called Engineer Mode. Next, in the window that opens, you need to select “Work with MTK”. When a question appears about granting root access, you need to confirm the operation.
Restoring access to engineering mode
In the event that the manufacturer of the mobile device decided to prudently remove the configuration program 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, all you have to do is install it. Due to the abundance of analogue clones, we will not indicate the exact name. You can simply 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 a 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 power consumption, limit scanning of unnecessary ranges and reduce the satellite search time. Let's take a closer look at the above features.
How to increase the volume?
The ringer volume is increased quite simply using 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. You should 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 editing is complete, click on the Set button, which is located here. Next, you need to reboot the device, while correctly exiting the program.
Operator frequencies
To optimize the power consumption of your mobile device, you can try disabling the scanning function for unnecessary frequency ranges. The standard frequencies when working in 2G and 3G networks in our country are 900 and 1800 MHz. The pair 850 and 1900 MHz is responsible for the American standard. To enable or disable a band you do not need, you need to use the Band Mode item in the engineering menu. Here you need to go into the settings for both SIM cards one by one and check the boxes next to the desired items. Pressing the Set button serves as confirmation.
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 alternately “Full” - “Cold” - “Restart”. Then you need to select Satelites or “Satellites”. Until the answer is recorded on the card. This whole procedure will take from 2 to 5 minutes. All you have to do is exit the engineering menu, close the program and reboot the device.
Not every person who has their own mobile phone thoroughly understands the various features of their device and the intricacies of its settings. In particular, many people do not know how to enter the phone’s engineering menu and why they need to do this at all. In fact, the engineering menu often becomes one of the main tools of specialists from various service centers, who eliminate all kinds of firmware errors or any malfunctions in the internal program of the device.
How to login?
Many people have heard about the engineering menu and know that you can enter it, but do not know how. You can enter the engineering menu by dialing *#*#3646633#*#* and pressing the Audio button, or simply by using the specialized MTK Recovery utility.
Audio
There are several categories in this section:
- Set Mode - select a profile.
- Normal Mode - standard profile.
- Headset Mode - mode for using a special headset.
- LoudSpeaker Mode - a mode in which the loudspeaker in the phone is activated.
- Speech Enhancement is a mode in which fully automatic correction of speech signals is carried out.
Before choosing any extreme values, you should make sure in advance that this will not cause you to experience any sound problems later. In the vast majority of cases, it is highly not recommended to do this for the reason that maximum settings can provoke the appearance of a rattling effect and a whole range of other interference, and will also create an extra load on the speakers, which provokes their faster failure.
In addition, never forget that before changing any settings, you must write down those that were set by default, so that if any problems arise, you can quickly return them to their original value.
Normal Mode
After you have figured out how to enter the phone’s engineering menu and what its main paragraphs are, go to Normal Mode. Here you will see a menu in which there are four items, among which the first item is the profile number. Paragraph FIR - 0 - should be left and not touched, and then move on to the next characteristics.
Initially, you should configure the overall volume modulation Tone, for which in the corresponding Value paragraph you will need to set the optimal volume value and press the Set button. Initially you can set it to 1, or try a variety of options from 0 to 100. The higher the value, the quieter the sound, while 0 is the maximum possible volume. But, as mentioned above, it is highly not recommended to set the value to zero, since the speakers will begin to produce a wide variety of side effects, such as sound rattling and much more.
Now we go to the Type Side tone menu, but here initially it is not recommended to touch anything, since it may happen that during the conversation you will only hear yourself, but not the interlocutor. Or try changing the values in different ways at your own risk. The most suitable characteristics are the following:
- Audio - 1.
- Speech - 1.
- FM - 1.
- Microphone - 1.
- Key-tone - 70.
If it seems to you that the music or radio is playing too quietly in the headphones, then you can slightly adjust the profile for the headset, but do not forget to restart the phone after that so that the settings are saved.
How to change the conversation volume?
The conversation volume changes through the engineering menu as follows:
- Let's go to the menu.
- Select Audio.
- We find the Speech enhancement characteristic, which is responsible for how well we hear the subscriber on the other side.
- Click on the Common Parameter button, and then select Normal Mode.
- Now look at the parameter Parameter (0), after which we set Parameter - 6.
- We begin to edit this parameter and change it from the standard 400 to 1, after which we press the Set key.
- Now audibility will become even more than acceptable, and in some cases you even have to lower the volume (Samsung’s engineering menu often gives this effect).
Headphone volume
By setting the following characteristics, you can adjust the volume of headphones or speakers in the direction you need while watching a video, as well as listening to music or the radio:
HeadSet Mode (type):
- Audio = 10.
- Side Tone = 50.
LoudSpeaker Mode (type):
- FM = 10.
- Side Tone = 50.
- Audio = 15.
Normal Mode (type):
- FM = 10.
- Side Tone = 50.
- Audio = 20.
By setting these characteristics, you will get an acceptable volume while listening to any materials. In particular, this allows you to create both the Samsung engineering menu of modern models and the menu of most other phones.
Service menu
The service menu also has several main items that may be of interest to users:
1.BatteryLog. The engineering menu of FLY and other modern phones allows you to get extremely accurate information about the condition of the battery, including temperature, voltage and other subtle parameters.
2.TouchScreen. A fairly wide parameter that has the engineering menu of FLY and other manufacturers that produce modern touchscreen phones. There are several submenus in this section:
- HandWriting. A fairly simple option is to draw with your finger on the screen, which allows you to check how well the sensors respond to touching them.
- PointVerification. Allows you to diagnose and, when you press the corresponding button, shows whether there are any errors and, if so, how much they deviate from the desired value.
- LineVerification. Almost the same as the previous point, only here lines are drawn from one point to another.
- ShakingVerification. Shake test.
additional characteristics
In the Type paragraph, you can also change other characteristics that interest you, from the volume of the speaker during negotiations (Speech) to the volume of keystrokes (Key tone). Again, all parameters must be set to a value between 0 and 255, after which the Set button is pressed, which saves the characteristics. The exact same procedure is also established in Headset Mode if you want to fine-tune the volume of your headphones. If you are a fan of a fairly high volume, which the phone cannot initially provide you with, then in this case the optimal values for you will be from 1 to 5, but not 0.
It is immediately worth noting the fact that these are not specific volume values, but only the principle is described. The specific values will directly depend on the characteristics of your speaker and microphone, because, for example, the settings provided by the Explay engineering menu can bring the parameters an order of magnitude higher than the capabilities of your phone, as a result of which it may simply break while trying to meet these parameters. Take this into account and try to choose realistic characteristics that can meet your needs.
How to check?
In most phones, the engineering menu provides a specialized Ring Tone item, which can be used to listen to any standard melodies directly from the engineering menu in order to determine how much we have changed the volume. Of course, it is best to call someone after completing all the settings and check the settings live, but if you are trying to do everything quickly and do not want to spend a lot of time, this function is the most optimal for you.
Increase the volume of conversations
The conversation volume is adjusted through the engineering menu in the service menu described above. You can enter it as follows:
- Dial *#*#3646633#*#*.
- Install the specialized program Mobileuncle Tools on your phone. The first menu in this program is the entrance to the engineering menu of phones. Using the program is much more optimal than doing everything manually, since there is no need to enter a large number of numbers. After all, only the values that will be optimal sometimes have to be selected within several hours.
After this, you can dial different numbers and check how well you can hear your interlocutor and yourself.
Explay Features
A separate feature of the Explay engineering menu is the Battary parameter, which is responsible for battery levels. This characteristic determines the battery charge level and tells the phone when to turn off the power while charging. Thus, you can slightly increase the battery life of the phone, but you must understand that this also affects the battery life, so changing these characteristics is not always the optimal solution.
It is also worth noting that the new type of phones have a function where when the battery is low, you cannot call other subscribers. It is in this situation that knowledge of how to enter the phone’s engineering menu to change the battery characteristics may come in handy, which will allow you to use its resource longer on outgoing calls.
Access to the engineering menu of your Android smartphone provides additional control options for the gadget.
In addition, this is a real opportunity to change "unchangeable settings", enable functions that are blocked but designed by the developer, and really improve (or ruin if ineptly interfered with) your gadget.
Engineering menu - what is it?
The engineering menu and hidden settings were present in the very first phones!
This gave and continues to give developers the opportunity to customize and test gadgets in the most unusual modes.
True, most are designed for smartphones and tablets based on the MediaTek processor.
Do not forget that if applications do not work correctly, you can create problems that are much greater than the problem of getting into the engineering menu, so be careful.
In addition, it is not a fact that the first application you choose will work correctly on your smartphone.
So you'll likely have to download and install several options before you find the one that works for you.
What parameters are available for configuration in the engineering menu
Of course, different smartphones may have different design schematics and menu functions.
Therefore, when you get to this function, you may find slightly different options and menu items on different phones.
Therefore, for example, a device on Qualcomm Snapdragon will have rather meager capabilities and everything will be limited to just viewing various parameters and testing them.
At the same time, smartphones based on MediaTek will have much wider capabilities.
However, remember that these settings are hidden by the developer for a reason.
When changing them, you must be aware of what you are doing, otherwise it may end badly for your gadget.
Important! Make it a rule to never change settings that you do not know the meaning of or are not sure how it will affect the operation of the device. Otherwise, you risk ruining your mood for a long time.
Information you can get from the menu
Basic data available on any type of smartphone:
Phone IMEI– personal identification (unique) number of the device.
Phone number– sometimes not specified;
Net– your operator;
Roaming– are you in roaming?
Network information– are you being contacted and is the network turned on;
Call forwarding– is it currently in use?
Network type, network index;
Signal volume.
Your location coordinates.
There is also a section “about the battery”, it will contain the following data:
1 State– whether the battery is currently charging or not.
2 Charge level– in percentage charge/discharge ratio.
4 Battery Type- production technology
5 Time elapsed since last charge.
In addition to this information, the engineering menu may contain much more various useful data, depending on the type of menu provided by the developers.
Testing a smartphone using Engineering Mode capabilities
It often happens that despite all the correct visible settings, the phone does not function correctly.
The speed of processes does not correspond to the stated parameters, the amount of RAM used is less than it should be, failures in the operation or installation of valid applications are detected, as well as a lack of proper functions.
And the standard user menu does not provide any way to detect the cause of such problems.
The engineering menu just makes it possible to conduct in-depth testing of the system and the device itself for hidden malfunctions or incorrectly set parameters.
The following modes are available:
1 General (Automatic Test)– this test will test every parameter of the smartphone;
2 Report– a full test report is displayed;
3 Testing of all functional modules, processor, memory cards and SIM cards, vibration, speakers, microphone, connectors - literally everything the phone is loaded with can be checked for adequate operation.
4 Screen tests– parameters such as brightness, clarity, sensitivity, response speed, compliance with visualization and touchscreen;
5 Testing work gyroscope, cameras, accelerometer, flash, and much more.
This is what testing mode looks like.
To open it, you need to go to the appropriate section (most often “Testing” or something like that).
This is only a small part of what the engineering menu can provide for testing, and as you would expect, different phones will have different tools for testing and the items of the tested objects will differ.
However, the benefits of such opportunities cannot be overestimated.
Such testing can help you understand whether changing settings will help solve a particular problem, or needed.
Or maybe the problem is at the level of a physical breakdown, and it makes sense, for example, to replace a part.
A similar test would also be useful when purchasing a used device.
Thus, you can immediately detect modules that are not working or have errors and understand whether the gadget is worth buying or not.
Let's look at examples of using the mode.
Adjusting the sound volume (Audio)
Thanks to the engineering menu, you can change the volume settings of the external speaker speaker, earphone speaker, headphone output, and, not least, the microphone.
However, in this case, you should also be guided by a real need, for example, if you are told that you are hard to hear (due to loud noise in the microphone, or because no matter how much you turn up the volume, you can be heard quietly, others can be heard well , namely you quietly).
Then it makes sense to change the microphone settings.
Otherwise, if your microphone is working well, you risk ruining people's enjoyment of talking to you on the phone by changing the microphone setting, the effect of which you yourself cannot hear.
To adjust the sound, do this:
1 Enter the menu and select the tab Hardware Testing, then Audio. Select the desired mode. They are as follows:
- Normal Mode– sound mode of the main speaker of the phone (which is near the ear);
- Headset Mode– adjusting the headphone volume level;
- LoudSpeaker– the volume of the external speaker – the loudspeaker that is used during hands-free calling;
- Headset_LoudSpeaker Mode– this is the sound level in the mode when the headphones and loudspeaker are working simultaneously.
2 From the list of tabs, select the settings of which device you need. Again, there are these options:
This parameter is very difficult to configure, so it is better not to change it.
If configured incorrectly, the phone may begin to hear itself, which may result in noise, whistling or an unpleasant echo.
So you or your interlocutor will begin to hear yourself during a conversation.
- Line "Level" This is a parameter for the value of each volume adjustment step in the standard menu. The ideal parameter is 0. It is better not to touch it, since this parameter is rarely knocked down or incorrectly configured.
- "Value is" and here is the parameter for each step of the volume of the external speaker (ring tone);
- Line "Max Vol", and there is a parameter that sets the upper sound threshold, that is, the maximum volume that can be set on the phone simply by adding the volume to maximum, for example, during a conversation.
Configuring cellular settings
In this case we will adjust the frequencies.
If you don't know what cellular settings your carrier is using, changing this window may result in loss of connection, so it's best to let your phone automatically select frequencies to communicate with.
However, unchecking unused frequencies gives a small bonus to energy savings.
At the same time, if your phone is intended for a different region and the manufacturer did not initially assign the frequencies you need, then this menu will help you enable them.
Attention! There have been precedents of criminal prosecution for unauthorized change of IMEI numbers. Moreover, the punishment can be a fine, a suspended sentence, a criminal record, and in some cases even imprisonment.Vprison!
Android special codes
In addition to the engineering menu itself, there are also various secret codes that help manage the parameters of your phone.
Rice. 8. Special codes on Android OS
The ability to manage and change settings is a definite advantage.
But let’s not forget that it’s not for nothing that they are hidden and intended for those who know what they are doing.
It's not for nothing that we don't have access to the parameters of the laws of physics of our universe?
Who knows what would happen if we were able to change the force of gravity or the boiling point of water? This is alarming, isn't it?
Use power carefully.
Advanced users of modern smartphones and tablets use the numerous functions that the Android engineering menu has. It allows you to obtain information about the mac address, check or configure the operation of Wi-Fi, Bluetooth, update the software of the camera, speakers. Very often, using such a menu you can improve the sound on your device and make other fine adjustments. For example, return the original Google account settings, specify settings for blocking and turning off the device, and set settings that allow you to create a backup copy of important information. Before entering the engineering menu, you need to understand that rash actions can lead to a malfunction of the device. It is advisable for the user to remember what changes were made to the system in order, if necessary, to return all settings to their previous state.
How to enter the engineering menu using the standard capabilities of the device?
The list of functionality can be opened by typing a specific combination of characters in the device call window. The Android engineering menu code varies depending on the brand of phone or tablet. Each manufacturer sets its own combination. Such information is usually indicated in the instructions for the phone and on official websites. Users of modern devices usually have no difficulty finding the required code.
Below we provide a table of the most common combinations. It is not recommended to use them unless your device is one of the listed brands.
The developers do not recommend executing such commands without certain knowledge and experience. But often only this method helps to quickly solve a number of problems related to, returning the device to its original state, and obtaining additional information about the device. The engineering menu is presented in English, which makes it understandable for most users.
Using additional programs
It is not always possible to find out the combination that is suitable directly for your device. In such situations, you can install special software on your mobile device, which will allow you to open a list of the functionality of your smartphone or tablet with a few clicks. It is publicly available for different versions of Android and device models.
The program for entering the Android engineering menu can be installed via a USB connection to a personal computer or laptop. One of them is called Mediatek Engineer Mode. It is a file EnMode.apk, which must be transferred to the device memory and installed in the usual way. This program is suitable for devices operating on the MTK processor. The user has the opportunity to download free and paid versions of the software. 
In the Google Play store you can download the Mobileuncle MTK Tools utility. It is designed for smartphones and tablets running Android 2.1. and later versions. The description says that such a utility is also only suitable for devices equipped with an MTK processor.
The Mobileuncle Tools program is suitable for owners. There are other utilities, for example, Shortcut Master, MTK engineering menu, launching MTK engineering menu. Before installing them, we recommend that you read the application rating, reviews from other users, and also check your device for compatibility.
Setting up optimal sound by opening the engineering menu
One of the most common reasons why users look for information on how to enter the engineering menu is the need to fine-tune the sound. The following situations may arise:
- Poor audibility when the speakerphone is on
- Sudden changes in the sound of an incoming call while listening to audio
- Insufficient signal volume
- Quiet sounds while recording video
- Quiet operation of the headset and microphone.
This is just a small list of installed settings that can be changed through the engineering menu of a modern mobile device. Sound settings are done through the Audio section, which is displayed immediately after entering the menu. Then various tabs will appear on the screen, such as Headset Mode. This tab allows you to set sound parameters that are activated when you connect a headset. Normal Mode sets the sound in the normal state of the mobile device (without connecting headphones or speakers).
LoudSpeaker Mode tab, which are activated when the loudspeaker is turned on. Headset LoudSpeaker Mode allows you to make settings for the active loudspeaker mode while a headset is connected to it. The Speech Enhancement tab provides settings that come into play when communicating over a mobile network.
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. At its core, 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 closed.
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 problem areas 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.
