I navigated to /storage/emulated/0/Download/, tapped midiag.apk, and—finally—the Android package installer woke up.
Done. 8.2 MB. 4 seconds.
This error often pops up on devices (particularly Xiaomi/Redmi/Poco devices running MIUI) during system updates. The system might be trying to install a diagnostic update alongside a major Android update. Use a file manager app to find midiag
Use a file manager app to find midiag.apk. Common locations include:
If you can’t find it, search your device using the file manager’s search function for midiag.apk. If the file is missing, redownload the firmware or tool package you were using. or if the process crashed
Your downloaded file might be corrupted.
Before diving into the fix, let’s understand what midiag.apk actually is. the setup wizard requests manual intervention.
The error message appears when the system or an installer script expects midiag.apk to be installed manually via a file manager, but the installation either failed or was skipped.
If you still see “Open file manager and complete midiag.apk installation. Then try again” after following the steps above, try these advanced fixes.
If the error persists and you cannot find the file to install, you might need to disable the service requesting it. This requires enabling Developer Options.
During the initial setup of a new device, the operating system attempts to install carrier bloatware or diagnostic tools silently. If the installation permission was denied, or if the process crashed, the setup wizard requests manual intervention.