Locate and open the Files , File Manager , or My Files app on your device's home screen or app drawer.

Here’s the part most guides skip. After installing, I didn’t just open the app. I went back to the original process that had failed earlier—the external tool that was calling midiag . And sure enough, the error was gone. The system now recognized the completed installation.

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.