Xiaomi Redmi 8A: How to Open and What to Configure

Xiaomi Redmi 8A is a popular model with a balance of price and functionality, but not all users know that the device’s “hood” is hidden engineering menu (Engineer Mode), which allows you to test hardware, calibrate sensors, check the operation of communication modules and even change hidden system parameters.

In this article, we’ll look at three proven ways to open the engineering menu on Redmi 8A, detail the functions of each partition, and warn you of possible risks, learn how to check battery performance, test the touch screen, adjust network settings, and even change IMEIs (with legality clauses).

If you are a beginner, we recommend that you first familiarize yourself with the basic menu functions without making changes. For experienced users, we have prepared advanced instructions with codes and screenshots (available via links in the relevant sections).

What is an Engineering Menu and Why You Need It

The Engineering Menu (or Engineer Mode) is a hidden Android section for service centers and developers.It provides access to low-level hardware settings that are not available in the standard MIUI. On the Xiaomi Redmi 8A, this menu allows you to:

🔹 Diagnose malfunctions: check the camera, microphone, speakers, accelerometer and other sensors.

🔹 Network Testing: Analyze the Signal GSM/CDMA/LTE, adjust antenna parameters, check the speed of the Internet.

🔹 Calibrate equipment: adjust the data of the gyroscope, compass, proximity sensor.

🔹 Change system parameters: for example, adjust sensor sensitivity or adjust power consumption.

However, it is important to understand that the engineering menu is not intended for the average user; certain settings (for example, changing the IMEI or the parameters of the communication module) can violate the law or lead to the locking of the device by the operator; In addition, improper actions can cause overheating, rapid battery discharge, or even “bricking” of the smartphone.

💡 Example of practical application: if you are not working well GPS, through the engineering menu, you can check the satellite signal and restart the navigation module without resetting the phone to the factory settings.

Method 1: Standard code for Engineer Mode login

The easiest method is to use service code, which works on most Xiaomi smartphones, including the Redmi 8A, and does not require superuser rights.

📱 Instructions:

  1. Open the phone (calling) application.
  2. Enter the combination: ##4636###.
  3. The screen will display a Testing menu with tabs “Phone Information”, “Battery Use”, “Use Statistics” and “Wi-Fi Information”.

🔧 What can be done in this menu:

  • 📡 View network information: type of connection (LTE/3G), signal strength, roaming.
  • 🔋 Check the battery: temperature, charge level, operating time.
  • 📶 Analyze Wi-Fi: speed, latency, MAC-address.

⚠️

⚠️ Note: The Phone Information tab contains a Ping Test option that can load the processor 100%. Do not use it for longer than 10 seconds to avoid overheating.

If the code didn't work, try the alternative: ##36446337## (displays firmware version and hardware data).

📊 Have you ever used an engineering menu on Android?
Yeah, often.
Yes, but only for diagnostics.
No, I'm afraid to break my phone.
I didn't know he existed.

Method 2: Use of the MTK Engineering Mode application

The Xiaomi Redmi 8A is built on a Qualcomm Snapdragon 439 processor, but some engineering menu features are available through MediaTek chipset utilities (MTK).

🛠️ Step-by-step instruction:

  1. Download the MTK Engineering Mode app from Google Play (developer: paphonb).
  2. Launch the utility and provide access to phone functions (calling permission).
  3. In the main menu, select MTK Settings.
  4. Go to the Hardware Testing section for equipment diagnostics.

✅ Advantages of the method:

  • 🔄 Intuitive interface with Russian (in some versions).
  • 📊 Ability to save test logs to file.
  • 🛡️ Less risk of accidentally changing critical settings.

⚠️

⚠️ Note: The app may not display all the features of the engineering menu due to Qualcomm's limitations. №3.

💡

💡

Before installing third-party utilities, check reviews - some applications in the Play Market contain advertising software or viruses. We recommend downloading only utilities with a rating above 4.5 and the number of downloads from 100,000+.

Method 3: Unlocking through ADB (for power users)

If standard methods don’t work, you can open the engineering menu via Android Debug Bridge (ADB), which requires connecting the phone to a PC and basic command line knowledge.

🖥️ Preparation:

  • 🔌 Turn on Debugging. USB in the developer settings (Settings) → The phone. → Version. MIUI (press 7 times) → Return to Additional Settings → For developers).
  • 💻 Install. ADB-computer-driver.
  • 📱 Get Redmi on board. 8A PC-only USB-cable (original!).

📝 Entry teams:

adb shell


am start -n com.android.settings/.EngineerMode

If the first command fails, try the alternative:

adb shell am start -a android.intent.action.MAIN -n com.miui.engineermode/.EngineerMode

🔍 What to do if ADB can't see the device:

  • 🔄 Restart your phone and PC.
  • 🔌 Try another one. USB-port (preferably) USB 2.0).
  • 📋 Make sure that the debugging settings are selected USB-configuration → File transfer (MTP).

⚠️

⚠️ Attention: Use ADB It can cause a reset if you type the wrong command, such as an adb shell. factory_reset Return the phone to factory settings without warning.

☑️ Preparation for work with ADB

Done: 0 / 5

Main sections of the engineering menu and their functions

After you log in, you'll see a list of technically named sections, and consider the most useful ones for the Redmi 8A:

📋 Table of key sections:

SectionAppointmentRisks/Restrictions
TelephonyGSM/CDMA/LTE testing, IMEI verification, network signalChanging the IMEI is illegal in most countries
ConnectivityDiagnostics of Wi-Fi, Bluetooth, GPSIncorrect GPS settings can impair accuracy
Hardware TestingChecking sensors, camera, microphone, vibrationVibration test can cause overheating
BatteryMonitoring of charge, temperature, discharge cycleResetting battery statistics requires root
Log & DebuggingViewing system logs, debugging applicationsLogs may contain confidential data

🔧 The most requested functions:

  • 📶 Antenna check: in the Telephony section → Network Selecting can be manually selected if the automatic search is not working properly.
  • 🔋 Battery calibration: if the phone suddenly turns off when 20-30% charge, in the Battery section → Battery Calibration can be reset battery data (root required).
  • 🎤 Microphone Testing: Hardware Testing → Audio → Mic Test is used to check the sensitivity of the microphone (useful if the interlocutors do not hear you when calling).

What happens if you reset the settings of the communication module?
Resetting parameters in the Telephony section → BandMode can cause network loss, and you can only restore them by re-activating them. SIM-card-to-phone.

Frequent Mistakes and How to Avoid Them

Even experienced users sometimes make mistakes when working with the engineering menu, and here are the most common problems and solutions:

❌ Error 1: The phone does not respond to service codes

🔹 Reason: A third-party call app (such as Truecaller or Google Phone) is installed that blocks service commands.

🔧 Solution: Use the standard phone application from MIUI Or temporarily disable the alternative call.

❌ Mistake 2: Mobile Internet Disappears After Menu Changes

🔹 Reason: In the Telephony section → BandMode has disabled the frequencies of your operator.

🔧 Solution: Go back to this menu and select Auto (automatic mode) or manually activate supported ranges (e.g. for MTS in Russia: LTE Band 3, 7, 20).

❌ Error 3: Phone overheats after equipment test

🔹 Reason: Long-term processor or graphics testing in the Hardware Testing section → CPU/GPU Stress Test.

🔧 Solution: Close the menu immediately and let the device cool. In the future, limit test times 1-2 minutely.

💡

💡

Before any changes to the engineering menu, write down the current settings (e.g., take a picture of the screen) to help bring everything back in case of a crash.

Working with the engineering menu is not only technical, but also legal.

⚖️ Change of change IMEI:

In the Telephony section → IMEI In theory, you can change the device's ID, but it's not:

  • 🚫 This is illegal in most countries, including Russia (Article 272 of the Criminal Code of the Russian Federation – unlawful access to computer information).
  • 📵 Communications operators block devices with fake IMEI.
  • 🔧 Xiaomi may cancel warranty if such changes are detected.

🔒 Risks to the guarantee:

Any changes to the engineering menu that cause a malfunction give Xiaomi the right to refuse warranty repairs, especially in the following cases:

  • 🔋 Calibration of batteries without root.
  • 📡 Manual frequency settings of the communication module.
  • 🛠️ Changes in charging parameters (may cause battery bloating).

🛡️ How to minimize risks:

  • 📱 Make a backup copy through Settings → Additionally. → Backup and reset.
  • 🔍 Use the engineering menu only for diagnosis, not for change.
  • 📄 Save screenshots of the original settings before editing.

FAQ: Answers to Frequent Questions

Can I open the engineering menu on Redmi 8A without root?
Yes, the first two methods (service code and MTK Engineering Mode application) work without root rights. The third method (ADB) also does not require root, but provides more features.
What if after the menu changes, the phone stopped catching the network?
Back to the Telephony section → BandMode and select Auto. If that doesn't work, reset your network settings in standard settings (Settings) → SIM-maps and mobile networks → Resetting network settings).
How to check the originality of the battery through the engineering menu?
Go to Battery → Battery Info. The original Redmi 8A battery should have a capacity close to 5000 mAh (permissible deviation of ±5%). Also check the temperature: when charging, it should not exceed 40 ° C.
Can the processor be overclocked through the engineering menu?
No, there are no overclocking options in the standard Engineer Mode, which requires root rights and specialized utilities like the Kernel Adiutor, but on the Redmi 8A, it can overheat due to a weak cooling system.
Why are some sections in the engineering menu inactive?
This depends on the firmware version and regional version of Redmi 8A. For example, in global firmware (MIUI Global) options for changing IMEI or manually configuring LTE frequencies can be blocked.