Chuwi hi 10 x bios reflashing

I need some help here!!!
A few days ago I received the chuwi hi10 x (model nr Q128G20010299).

Unfortunately I made a big mistake changing some options on the BIOS 's
graphic section. Currently the tablet seems to run(the little red light
is blinking) , but I can’t see anything (screen is black). I connect a
USB pen-drive and is blinking too.
I suppose I need to flash BIOS but I don’t know how.
Could you please help me fix it?

Thank you in advance

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