To successfully complete the installation of the (likely a variant of the Xiaomi DeviceDiagnostics APK ) using an open file manager, you must navigate through Android's security protocols and system-specific optimizations. Navigating the Open File Manager

Not all file managers are equal. The stock “Files” app on many phones hides APKs by default (looking at you, Pixel). I had to open (my go-to), but any manager works—CX, MiXplorer, or even the basic “My Files” on a Samsung.

If the device has been modified, the system may be missing the certificate required to silently install the APK, forcing the user to do it manually via the file manager.

Locate the midiag.apk file (usually in the folder).

After successful installation and tapping “Try again,” the setup should continue. Signs of success include: