Open File Manager And Complete Midiag.apk Installation. Then Try Again -

How to install a mobile application using the APK-file on Android

If you haven't installed apps from outside the Google Play Store before, the system will block the action. How to install a mobile application using the

The tool pushes a system utility named midiag.apk (or XiaomiDiag.apk ) to your phone, but Android’s security restrictions prevent it from installing automatically. To proceed, you must manually complete the installation through your device's file manager. Step 1: Locate the midiag.apk File Step 1: Locate the midiag

The installation cannot finish until you manually trigger it within the phone's operating system. Look for a file named midiag

Open the app (on Xiaomi, this is usually just called "File Manager" or "Mi File Manager"). Navigate to the Downloads folder or the APK category. Look for a file named midiag.apk or XiaomiDiag.apk . Step 2: Grant Installation Permissions

The error message is a specific instruction frequently encountered by Xiaomi (MIUI/HyperOS) users. It typically appears when a third-party tool—such as ChimeraTool or a Xiaomi Diag Enable Tool—attempts to activate Diagnostics (Diag) Mode on a device to repair IMEI, flash firmware, or perform advanced hardware testing .