Couldnt come into BIOS

Tryed all variants, bios menu not loading
esc, del, and others variants
i can see just black screen,
it happens when early i was in bios mode and choose WIN7 in to load in bios menu
How to fix it please

If your problem is, that the internal screen is not working anymore (black screen) but the blue LED lights up, then your tablet has a common problem that CHUWI has not addressed yet.

ive solved with this info in another post

You can blind circle around in BIOS. Pressing Esc while booting and ctrl+fn+f3, enter, then ctrl+fn+f4, enter to reboot