I recently purchased the teclast M89 android tablets. Last night i set up my security pin; And today i couldn't access the tablet because: Its asking for pin code, But no keyboard appears on the screen. So i'm locked out of my own device. This is unacceptable. I don't expect this from a reputable company doing business here in the US. I'm very disappointed with this devise and with the inconvenience and lost of time & productivity that this company / device has cost me .