I want to flash the OS by USB or Network ?Because Ican’t get the recovery mode. what should I do ？
How to achieve system backup and recovery through USB or network ？
Can you power on the device?
If so, you can do it as follows:
sudo reboot –force forced-recovery
FYI, to use flash software you must be in recovery mode and have the micro-B USB available. However, what @euskadi is suggesting would be a way to enter recovery mode through software rather than through the recovery button. You’d still need the micro-B USB. If for some reason you reach recovery mode through software (or hardware), and then lose the ability to boot after a failed flash, then there would be no method left to update the unit.