Dear disc whisperers,

I have a WD10JMVW-11AJGS1 with a corroded PCB (2060-771961-001 rev A). I'd had a technician swapped the BIOS chips to donor PCB but couldn't saved the disk. I recently realized that U12 and U14 chips have different marking. Actually one is marked clearly as Winbond 25X20CLVIG but the other is unmarked. I also have two chips lying in the same box with similar pattern.
I assume there was a mix up during swap and I read the dumps with CH341A. I searched through one the file and at 0003F080 line, I found my HDD model. Unfortunately I cannot tell if this one is U12 or U14.
Is there any chance that you can check at which position this chip needs to be soldered?

Also, the donor PCB I used is rev B. Seller claims rev A and B are interchangeable but I'm not certain about that.

Thanks.

That's the 'ROM' and needs to be at U12.

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