I need Chuwi HI12 Z8350 Dual Boot Bios Files

Hello, I bricked my tablet because I update the bios with wrong firmware.

Actually I need the bios for chuwi hi12 z8350 cpu, dual boot version.

The bios files for z8300 cpu not solve this problem.

My tablet’s serial number is Q64G45161100812

Can help me?
Thanks