I have the same issue as DIGImend/uclogic-tools#10 except re-plugging the device does nothing. The PID changes to fff2 and it seems to be bricked. It is not possible to turn it one via button, it does not recognize the pen, it does nothing.
Here is a similar problem with a different device:
https://safereddit.com/r/XPpen/comments/1hkkj49/hard_bricked_device_i_think_star_g640/
DIGImend/uclogic-tools#14 (comment)