Q: How do I flash the bois
A: You can move the BIOS from your original PCB by using hot-air gun, then solder it on the replacement board. Please refer: http://www.datarecoveryunion.com/hard-drive-rom-chip-swapreplacement/. Or you can find an electronics repair shop help you.
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Note: Send clear photos of your PCB (both sides) by attachments will make everything easier!