**FIXED** RE:
I have been in touch with Boox support team. After almost 2 weeks in agony, they released a fix to firmware version 3.5.4. Finally, my Onyx Note Air 3C is shining as new.
I have been in touch with Boox support team. After almost 2 weeks in agony, they released a fix to firmware version 3.5.4. Finally, my Onyx Note Air 3C is shining as new.