Such an attitude is truly inconceivable and unacceptable, if you Giuliano know how to intervene, I would agree with you to take action against Teclast

I bought mine from Banggood in October 2019 and I had the problem in late August (now it’s working fine without use Sharpkeys)

but have you thought the problem in the same period for everyone?

I have the same problem with Key “1”. Solution?