How can I access fastboot mode?
Wait a few seconds after shutting down; Press the power-on key for about 1~2s and immediately press the volume reduction key. When the logo appears, continue to press the volume reduction key and release the power-on key,
Until you enter recocery mode, then use the volume plus and minus keys to move up and down to select the desired option, and press the power key to confirm the execution.
Can i use fastboot oem off-mode-charge 0?