Don't worry, no one can brick their begode during firmware update unless they force it, i'm on a limited data plan at that time using home wifi for updating & it bricks
Bricking Procedure
Switch off mobile data, switch on wifi, bluetooth, location if you're on Android & connect to your home/ office wifi
Connect begode app, login, go to firmware update & it will display latest firmware but when you click at update, it will start but won't fully update & the whole wheel shuts down
Repeat above process, quickly toggle off/ on wifi or bluetooth ( can't recall exactly ) the firmware update will proceed to wipe the whole firmware & bricks the wheel
After this there is no response from power button, doesn't balance, completely dead, the light might be on but you can't switch it off. Congratulations you have brick your wheel
UnBrick Procedure
Unplug & plug in back the power. Your wheel should be off now.
Press the power button, don't let go, press the lift cutoff button 5 times, the buzzer should sound & the red on board LED should slowly flicker now
Switch on your mobile data, connect & clicking at begode app firmware update, it should update to 100%, power up your wheel & it should be back a life !
Tips : Did few experiment, i have to continuously pressing the lift cutoff button for more than 5 times then only the buzzer will sound. If it doesn't work, just off/ on power & try again.