rom flashing – Emdoor EM TS809 Dead Boot – KCOLO point wanted to revive

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.

https://www.globalsources.com/Voice-activated-speaker/MT8167-EM-TS809_R70-1173578814p.htm#1173578814

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?

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