Ensure the tablet is completely powered off and disconnected from the PC.

Use the PCB version number in your search queries. For example, searching for terms like Q8H firmware download , GT90h A23 ROM , or the PCB number you found (e.g., "AJ002-MB-VER5.3") on specialized forums can lead you to the correct files. Key forums and communities to check include:

Once complete, a message saying will appear. The device will automatically reboot.