Looking for proper BIOS for Chuwi Hi8 Pro 64bit

Hello,
I have tried to flash my Chuwi HI8 Pro with the BIOS which is supposed to solve my SD card issues. I must have botched it as I bricked my tablet - it does not start at all. I found a nice guide on how to reflash my BIOS via external EPROM programmer tool but I need to identify the proper BIOS first. Could you provide me the right BIOS, please? The serial ID of my tablet is: PQ32G22170900052
Thanks in advance for your help!
Regards,

Zoltan K.

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