How to open an engineering menu on Xiaomi Redmi 8A: Secret codes and safe ways

Xiaomi Redmi Smartphone 8A hull MIUI There are a lot of useful tools that are not available in the standard interface, and the engineering menu is one of those tools that allows you to test hardware, calibrate sensors, and even change some of the network parameters. However, not all users know how to get there, and most importantly – how not to harm the device when working with it.

This article will not just tell you how to go to the engineering menu on Redmi. 8A, It will also explain what features are available and what you should stay away from, and we will look at official and alternative login methods, warn against common errors, and provide recommendations for the safe use of hidden opportunities. If you are a beginner, don’t miss the warning section!

It is worth noting that the engineering menu on Xiaomi is different from similar menus on other brands (for example, Samsung or Huawei). 8A. Instructions for other models may not be suitable.

What is an Engineering Menu and Why You Need It

The Engineering Menu (or Engineer Mode) is a service section of the Android operating system that is designed to diagnose and debug hardware, and you can check the work:

• 📡 Network modules (GSM, LTE, Wi-Fi, Bluetooth)
• 🔋 Battery (real capacity, charging cycles)
• 🎤 Microphones and speakers (sound test, sensitivity)
• 📱 Touch screen (calibration, multi-touch test)
• 📡 GPS and sensors (gyroscope, accelerometer, compass)

At Xiaomi Redmi. 8A The engineering menu is particularly useful for:

• 🔧 Repair – Checking the operability of components after replacement (e.g., display or battery).
• 📶 Network Optimization – Manual Switching Between 2G/3G/4G, If the automatic system is not operating smoothly.
• 🔋 Battery Diagnostics – Identifying Battery Wear Without Third-Party Apps.

However, changing certain parameters (such as battery voltage or CPU frequencies) can cause the phone to malfunction or even fail, so you should understand what each menu item is responsible for before any manipulation.

💡

If you are not sure about your actions, back up your data through Settings. → Additionally. → Backup and reset before entering the engineering menu.

Official method: Entry through code ##4636##

The easiest and safest method is to use service code. 8A (As with most Android devices, a universal combination works:

##4636##

Step-by-step:

1. Open the phone (calling) application.
2. Enter #4636## as if you were dialing.
3. Wait for the automatic redirect to the engineering menu (usually takes up a lot of time). 1-2 seconds).

If the code didn't work:

• 🔄 Check that you enter the characters accurately – without spaces and unnecessary signs.
• 📱 Make sure you use a standard caller rather than a third-party app (like Truecaller).
• 🔧 Update the firmware: Sometimes old versions MIUI lock down service codes.

Charge your phone at least 50 times%|Shut down. VPN proxy|Close all background applications|Connect to stable Wi-Fi (for network tests)-->

After successful entry, you will see a menu with several tabs:

• Information about the phone - data about the model, software version, IMEI.
• Information about the battery - charge level, temperature, voltage.
• Usage statistics – application activity, screen time.
• Wi-Fi settings – manually adjust channels and signal power.

Alternative login methods (for experienced users)

If the standard code doesn't work, you can try other ways, but they require more action and sometimes root rights.

Method 1: Application "Equipment test" (MTK Engineer Mode)

• 📥 Download from Google Play app MTK Engineer Mode (suitable for Mediatek processors but on Redmi) 8A Snapdragon 439 may not work).
• 🔧 Launch the application and select MTK Settings → Engineer Mode.
• ⚠️ Be careful: some features in this menu may conflict with the firmware MIUI.

Method 2: Through ADB (developer)

1. Turn on the debugging. USB In Settings → The phone. → Version. MIUI (Press 7 times to unlock the developer mode).
2. Connect your phone to your PC and type in the command line: adb shell am start -n com.android.settings/.DevelopmentSettings
3. In the developer menu, find Engineer Mode.

Method 3: Through Recovery Mode (Risky!)

⚠️ Note: This method may cause resets or damage to the firmware. Use only if other methods do not work and you understand the risks.

• 🔄 Turn off the phone, then press the power. + Volume up to enter Recovery.
• 🔧 Choose Advanced → Engineer Mode (if there is such a point).
• 📱 After leaving Recovery, the phone can restart longer than usual.

What Engineering Menu Features Are Safe to Use on Redmi 8A

Not all sections of the engineering menu are equally useful (or safe).Here's what you can test without risking your phone:

Here is what is best to refrain from:

• 🚫 Band Mode - Manual frequency change 4G/LTE It can lead to the loss of the network.
• 🚫 Factory Reset – reset to factory settings (there is a separate button in the standard settings).
• 🚫 Hardware Test → Auto Tests – Automatic Tests Can Overheat Processors.
• 🚫 Any parameter with "Voltage" or "Current" - change of voltage can cause the battery to fail.

💡

At Xiaomi Redmi. 8A It is safe to use only partitions for diagnostics (viewing information) and any changes to network, battery or processor parameters may cause problems.

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 ones:

Mistake 1: Change network settings without knowing the consequences

⚠️ Note: If you manually turn off the main frequencies 4G (So, for example, Band 3 or Band 7, the phone might lose communication with the operator, and to get it back, you'd have to reset your network settings or refashion the device.

🔹 How to avoid: Write down your current settings before changing (take a screen picture) or use apps like NetMonster to analyze networks.

Mistake 2: Testing the battery under high load

Some tests (such as Battery Health Check) trigger a discharge/charge cycle, which can speed up battery wear. 8A With its modest 5,000mAh battery, this is particularly noticeable.

Error 3: Using the Engineering Menu on Custom Firmware

If you have installed an informal firmware (like LineageOS or Pixel Experience), the engineering menu may not work properly or even be available.

• 🔄 Infinite Reboot (Bootloop).
• 📵 Poose. IMEI (Remediation is required QCN-file).
• 🔋 Fast battery discharge due to downed energy saving settings.

Mistake 4: Neglecting backup

Even if you're just looking at the data in the engineering menu, you should do a backup, for example, through:

adb backup -apk -obb -shared -all -f /sdcard/backup.ab

This command will save all applications and their data to a memory card.

How to Get Out of the Engineering Menu and Get Everything Back

If you accidentally changed your settings and your phone is unstable, there are several ways to get it back to its original state:

Method 1: Program reset

• 📱 Go to Settings. → System system → Resetting settings.
• 🔧 Select Network Reset (if communication problems) or Reset all settings (if changes affect system settings).
• ⚠️ Application data and files on the phone memory will not be affected, but all Wi-Fi passwords and mobile network settings will be reset.

Method 2: Manual recovery through ADB

If you have changed the settings associated with the modem or radio, the team will help:

adb shell am broadcast -a android.intent.action.AIRPLANE_MODE --ez state true


adb shell am broadcast -a android.intent.action.AIRPLANE_MODE --ez state false

This will restart the network modules.

Method 3: Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fastboot Fast Fastboot Fast Fastboot Fast Fastboot Fastboot Fast Fastboot Fast Fastboot Fast Fastboot Fast Fast Fastboot Fastboot Fast

⚠️ Note: This method should only be used if the phone has stopped turning on or lost. IMEI. For Redmi. 8A The official firmware from Xiaomi will come. ROM For its model (Ginkgo is the code name Redmi). 8A). Unpack the archive and launch it. flash_all.bat (Windows or flash_all.sh (Linux/Mac). Connect the phone in Fastboot mode (clamp Power). + Loudness down).

Useful hidden features Xiaomi Redmi 8A (non-engineered)

If you just need to test your phone or optimize it, you don't have to go to the engineering menu. MIUI There are a lot of hidden features that are enabled through codes or developer settings:

1. Camera and display test

Enter the code:

##2886##

A test menu will open:

• 📸 Camera - checking focus, color reproduction.
• 🖥️ Screen - Search for broken pixels.
• 🔊 Audio – test speakers and microphones.

2. Mode EIS (video stabilization)

To enable improved stabilization when shooting video:

1. Open the camera.
2. Go to Settings. → Additionally. → Stabilization of video.
3. Choose Improved (EIS).

3. Hidden performance menu

Activate the developer mode (7 taps according to the version) MIUI), later:

• 🔧 Turn it on. GPU-play-off.
• 📱 Turn off window animation to speed up the interface.
• 🔋 Activate Background Process Limitation to Save Battery.

Resetting battery statistics

If the phone does not display the charge level correctly, do:

##4636## → Battery Information → Menu → Reset battery stats

FAQ: Answers to Frequent Questions