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

If you haven't installed apps from outside the Google Play Store before, the system will block the action.

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 . If you haven't installed apps from outside the

The installation cannot finish until you manually trigger it within the phone's operating system. If you haven't installed apps from outside the