Thanks for your help. Trying to backup or reflash BIOS with an external programmer is a good solution, but I prefer to forget the idea of disassembly because the warranty is running and the seller asked me to send back the tablet…
Such a shame that Teclast doesn’t answer to my questions or provide a BIOS update that we can put on a simple USB Key to reflash it ! :-/
Good luck in your operations !
(Sorry for my bad english I’m from France…)
Teclast TbooK 10 / Huawei Honor 7