On the Redmi 9A (running MIUI 12 or later based on Android 10 Go edition), these codes interface directly with the and the Engineering Mode (Engineer Mode) – a low-level hardware testing environment.
The Redmi 9A has a powerful built-in hardware test suite. You can access it directly: How to Use Secret Codes on REDMI 9A
Provides detailed phone information (signal strength, connection type), Wi-Fi status, and usage statistics. Charging & Battery Info: *#*#6485#*#* On the Redmi 9A (running MIUI 12 or
You can manually test every hardware component, including the touchscreen, speakers, microphone, vibration, camera, and sensors . This is incredibly useful if you suspect a part of your phone is malfunctioning. 2. Detailed Phone & Network Information Code: *#*#4636#*#* Function: Opens the Testing menu. including the touchscreen