I'm using UBports to flash the volla tablet to android, because I bought the UT version and I don't like it.

I enabled dev mode in UT, and my PC connects to the Volla Tablet through UBports. But once it tries to reboot the tablet into bootloader, the screen goes black and nothing more happens. When I eventually turn the tablet back on, it boots and UBports goes to "Settings slots..." but at that time, the process is broken.

It happens on several PCs and I have tried different cables. Any help is appreciated. Thanks!