i flashed my BIOS with an EZP2010 Flasher, the writing was without any problems and verify also went ok. Tablet connect to charger, power on -> nothing.
What is your tablet version K9C6 or K9C3? Have you measured the battery voltage? If the the battery level is too low (like 3v or something similar) the tablet won’t turn on, you need to wait for it to charge.