Flashing with a bad firmware to this tablet became completely unresponsive and does not switch on. M/B marks report that is created from Emdoor and its model is EM TS809.
I tried to revive it, by shorting GND and KCOLO joints and reflashing with SP Tools. Unfortunately, joints do not have descriptions so I tried every joint without voltage. None of them worked. Does anyone know if this M/B has KCOLO or just COLO/KOLO joint?