You know that swapping PCB can’t reslove the HDD’s firmware problem.
Most HDD’s firmware problem can be resloved by Data Recovery comapny. They have the professional tools, such as PC3000 which can rewrite the frimware. However, not all the HDD’s firmware problem can be fixed by Data Recovery company.
If your HDD is Toshiba, Seagate(7200.12) or lastest WD HDD, the firmware problem can’t be resloved by Data recovery company.
HDDZone.com provides all kinds of hard drive PCB boards. Free shipping worldwide!
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Useful Guide: Hard Drive PCB Replacement
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Note: Send clear photos of your PCB (both sides) by attachments will make everything easier!