I’ve read your blog post :
HDD PCB BIOS
I have a hard drive Samsung HD251HJ with BF41-00204B PCB.
The drive does not spin and I want to buy a similar PCB but I want to know whether it has a BIOS chip or the bios is integrated in the IC controller.
The PCB’s BIOS is integrated into the Main Controller IC. You should exchange the Main Controller IC to let the HDD be recognized. Move the Main Controller IC(the biggest chip on the board) is a complex job which need you have certain technique. Some electronics repair shop can do it.
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Note: Send clear photos of your PCB (both sides) by attachments will make everything easier!