I wrote a reply a few days ago but it seems to have vanished. I'm not sure if I understand you correctly Admin. I am inputting the correct PIN in a normal fashion, exactly the same as I do on the other Blackview devices I have. As you can see from the link above I'm not the only person with this tro...

Hi. There seems to be a fault with the Tab 8. If a security pin is set up then when the device locked, it doesn't accept the pin and stays locked. The only fix is a factory reset. It works fine with a security pattern, but not a pin. I see other people are having the same trouble too -  https://uk.t...