I flashed the bios file that you gave me, using CH341A programmer but unfortunately something is wrong. At the end of flashing I received the message “Chip with the content are in disagreement”.
Need to see how many volts feeds the UEFI on the motherboard of the tablet, the programmer outputs 3.3 V, and Uefi can be at 1.8 V, there is a risk to damage the chip, UEFI!