CHUWI HI12 DOES NOT TURN ON THE SCREEN

Hi everyone, I have a problem with my Chuwi hi12 the device charges and the USB ports for the mouse or keyboard work. from what I saw on YT I’m not the only one who has happened to, but unfortunately my poor tablet no longer turns on the screen.What should I do? And above all, how can I contact assistance even if it is no longer under warranty in case you have no ideas? Thank you and good day