I rebooted the power button and restarted in bootloader error.
I had to wait until the battery emptied, I tried with adb reboot bootloader anr reboot semmpre in bootloader error.
now I'm waiting for the battery to empty again.
Ok! Please try the next time by boot up this, -
Press and hold Volume UP key and Power key for a few seconds ( don’t press Power key so long )
Keep pressing Volume Up key until EMUI icon and Recovery mode menu appears
Use Volume keys to select Menu
Use Power key to Confirm