First, let's clarify what this file is. In the context of Android devices, particularly Xiaomi models, Midiag.apk is a system-level diagnostic tool. It is widely discussed in technical forums like XDA Developers and GSMdost as a utility used to access a device's diagnostic mode ("DIAG") for advanced tasks, often related to network or IMEI repairs. This is a powerful tool intended for experienced users, so please proceed with caution.

Exit your settings menu and open your app drawer. Look for an icon shaped like a folder or a cabinet labeled or File Manager . Tap to open it. Step 2: Navigate to the Storage Directory

The installation will proceed. Once finished, you can tap Open to launch the app or Done to exit the installer.