How to enter the engineering menu on Xiaomi Mi A2: the complete guide

Smartphone Xiaomi Mi A2, Android One has a clean operating system, but this does not deprive it of access to hidden system functions. The engineering menu is a special diagnostic interface designed to test hardware modules, check communication quality and fine-tune radio frequency parameters. GSM-signal, unstable operation GPS or the need to reset certain parameters of the communication module to factory values.

Unlike MIUI shells, where access to an engineer is often hidden behind additional permissions, in the stock Android on the Mi A2, the login procedure can vary depending on the firmware version and region. It is important to understand that interfering with low-level drivers without a clear understanding of the consequences can lead to incorrect operation of the device. However, if you want to conduct a professional diagnosis or configure a signal amplifier, knowing the correct codes and sequence of actions will be an indispensable tool for you.

In this article, we will discuss in detail all known ways of entering, including universal commands and specific to Qualcomm processors. We will also consider which parameters can be safely changed and which are better left unattended so as not to disrupt the operation of the radio module. Preparing for work with system settings requires care, but the result is often worth it, especially in areas of uncertain reception.

What is an engineering menu and why it is needed

Engineering Mode is a hidden part of the operating system that provides direct access to the management of the hardware components of the smartphone. In the context of Xiaomi Mi A2, built on the platform Snapdragon 660, this interface allows you to conduct in-depth diagnostics of GSM, WCDMA and LTE modules. The average user rarely faces the need to change these parameters, but if there are problems with communication, this is the only way to programmatically influence the situation.

The main function of this section is to test equipment before sale, but the functionality remains available after purchase, it can test the performance of speakers, vibrator, proximity sensor and, most importantly, adjust the sensitivity of antennas. The key advantage is the ability to view detailed statistics on connected cell towers, which is not available in the standard Android interface.

⚠️ Note: Change the settings in the BandMode section or RF Tests without understanding their purpose can lead to the complete disappearance of the network.

It is worth noting that on Android One devices, some items can be hidden or renamed compared to classic firmware. MIUI. This is done to ensure the stability of the “clean” Android, but basic diagnostic features remain available through special devices. USSD-emulator commands or applications.

Preparation of the smartphone for diagnostic procedures

Before you start entering secret codes, you need to make sure that the device is ready to work in debugging mode. While root rights are not usually required for basic login through the phone book, advanced features may need to enable developer mode. On the Xiaomi Mi A2, this is done in the standard Android way: seven quick clicks on the build number in the About Phone section.

It is recommended to charge the battery of the smartphone up to 50-60% in advance. Working with engineering settings, especially tests of the radio module, can consume a significant amount of power. In addition, voltage stability is critical when restarting the radio part to avoid software failures.

It’s also worth removing unnecessary apps that may conflict with system processes, or at least close background tasks. If you plan to use third-party apps to access the menu (as discussed below), make sure you have an apk installation file, as Google Play often doesn’t have such utilities or has limited functionality.

Universal codes for entering the Engineering Mode

The easiest and fastest way to get into the hidden menu is to use special character combinations in the Phone app. For Qualcomm-based devices, which include the Mi A2, there are several standard codes. Type the following sequence in the number dialer:

##3646633##

This command #3646633## is the most common command for MediaTek chipsets, but it often works on Qualcomm via emulation or system aliases. If the menu doesn't open after entering the last digit, try an alternative code specific to testing GSM:

##4636##

The second code opens the Testing menu, which is part of standard Android and is available on almost all devices. Here you will find the "Phone Information", "Usage Statistics" and "Wi-Fi information" sections. It is in the "Phone Information" section that you can switch your preferred network type, forcing LTE only or WCDMA.

• 📱 Telephony: A section for managing call settings and network type.
• 📶 Cell Info: Detailed information about the current cell and signal level.
• 📡 PDP Context: Access Point and Status Settings GPRS-linkage.

⚠️ Note: Code #0#, popular on Samsung, Xiaomi Mi A2 Only use codes that are compatible with the Snapdragon architecture.

Use of engineering menu emulator applications

In cases where standard codes fail or functionality is trimmed by the manufacturer, specialized applications come to the rescue. Since the Xiaomi Mi A2 runs on pure Android, installing third-party software from unknown sources requires security confirmation. The most effective solution is the MTK Engineering Mode utility (despite the name, often has compatibility) or Qualcomm-specific tools such as Qualcomm Product Support Tools (requires a PC) or mobile analogues like Engineer Mode MTK.

To install such an application, you will need to download an apk file from a trusted source, as the official Google Play store is becoming less and less of these tools due to security policy. Once installed, simply launch the application and it will try to open the system menu using internal Android calls.

If the menu does not open even through the application, then access to it is closed at the firmware level or requires the rights of a superuser (Root).

Adjusting the radio module and improving signal reception

One of the main reasons Xiaomi Mi A2 users are looking for access to the engineering menu is the weak cellular signal. In the test menu (usually the Telephony -> Network Selecting tab), you can force the mode of operation. For example, if 4G is bad in your area, but 3G is great, you can switch the phone to WCDMA Only mode.

Also available here is the reset function of the radio module. If the phone "stuck" on the tower with a bad signal and does not want to switch to a closer, manual network selection or temporary switch to "Only 2G" mode, followed by returning to automatic mode can help re-register the network again.

The BandMode menu allows you to turn off frequencies that are not used in your region, which can theoretically speed up network search, but in practice on global versions of the Mi A2 it is better to leave all ranges on. Incorrect settings can cause the phone to stop seeing your carrier's network.

Diagnostics and testing of hardware components

The engineering menu allows you to run automatic tests of various components of the Xiaomi Mi A2. This is useful when buying a used device or if you suspect a malfunction of iron. In the relevant sections, you can check the performance of the touch screen (Single Point Test), determine the broken pixels on the screen and check the response of the proximity sensor.

The audio test is worth a special attention: you can consistently check the main speaker, the speaker and the microphone, the system will play test sounds or record your voice, allowing you to assess the quality of the audio track without having to make real calls.

• 🔊 Audio: Check all sound playback and recording channels.
• 📸 Camera: Testing the focus and shutter of the cameras.
• 🔋 Battery: View detailed charge and temperature status (if available).

⚠️ Warning: Vibrator test can be very intense.Do not hold your phone in your hands during a long vibration test, so as not to drop it.

To test the screen, you use a color and touch test, and if you swipe through the circuits of the squares, you make sure that all areas of the display respond to touch, which is especially true for the Mi A2, because the plumes may have moved away when they fall, which is not always visible.

Frequently Asked Questions (FAQ)

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Use the engineering menu only to diagnose and temporarily change network settings. Constant operation in non-standard modes (for example, only 3G) can lead to increased battery consumption and overheating of the modem.