Open | File Manager And Complete Midiag.apk Installation. Then Try Again !new!

This message typically appears on Xiaomi (MIUI/HyperOS) devices when a tool on your computer (like ChimeraTool or TSM Tool) attempts to enable Diagnostic (Diag) Mode

If you continue to encounter issues, it might be helpful to provide more details about the error message you're seeing or the context in which you're trying to install and use midiag.apk .

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

. You may need to grant permission to "Install unknown apps" for the File Manager in your system settings.

Next time an APK won’t install from a notification or a web link: