M5StickV serial port blocked...

I’m testing the M5StickV with Maixpy IDE but suddenly I can’t connect to it. The board is detected on ttyUSB0 but I’m not ablee to upload any firmware and I’m getting this error on kflash_gui:

Check your settings and try again, or replug in USB cable
Greeting fail, check serial port (Attempting to use a port that is not open)

The screen is off and I am not able to connect to it via Putty.

Is there any way to hard reset this device?

Thank you a lot!

I just recover it holding the power button for a long time. Thank you anyway :slight_smile: