If you see a Reboot and Select proper Boot device. Or Insert Boot Media in Selected Boot device and press a key message on Windows 11/10, see this fix.

How to Fix a Boot Loop in Android. When your Android's system files stop communicating correctly, the device may end up having difficulty starting. Boot loops are the result of system files not ...

Press Power button to select and start the master reset. When the master reset is complete, ‘Reboot system now’ is highlighted. Press the Power key to restart the device.