I’m new here and I have a question. Exist a bios update and a custom ROM for the Teclast X98 air iii (M5C5). Or can I used the bios and custom rom from the X98 air 3G?
There is no confirmation about Air 3G bios is compatible for Air III. So, it is better to use Air III 64GB version bios(M5C6).
Follow instructions in this link.