mobile

I had a somewhat small problem with this tablet - the virtual keyboard was not as fast as i'd exected to be. So I wanted to reinstall the OS by reflashing the rom/tool provided at http://www.needrom.com/download/chuwi-vi8/ .
It went well, the OS installed but at the end, that tool updated the uefi firmware too. I expected that, i kinda knew what I was doing. At about 80% of uefi flashing, the device went blackscreen and today it's still like that, Maybe battery was too low or it was simply the wrong Bios-uefi This is the first device I permanently broke.... It cannot be connected to a PC simply because it's a PC by its own... Or is it? There is no info on flashing dead win8.1 tablets on google.... Please help me out!