The screen of the rugged tablet glowed faintly in the dim light of the repair bay. Elena wiped grease from her fingers onto her jumpsuit, staring at the error message that had plagued the field team for three weeks: “Midiag Core Missing – Calibration Failed.”
- The Limitation: Many Chinese Android variants (or HarmonyOS) restrict background installation permissions for third-party apps. The installation script (GBox/GMS Installer) can download the file, but it cannot trigger the
ACTION_INSTALL_PACKAGE intent without user intervention.
- The Workaround: By forcing the user to manually locate the file, the process bypasses the OS restriction. It relies on the user granting install permissions to the File Manager app, which acts as a trusted proxy to install the
Midiag.apk.
Installation execution
If the installation fails on a Xiaomi device, you may need to adjust developer settings: