My External hard disk was not working.
I though my board was wrong so I bought used sub board.
I found i need to switch the bios chip but I dont know how to do.
Can you help me for this.
this is my original board
Please let me know if you can help me on this.
You can move the BIOS from your original PCB by using hot-air gun, then soldered it on the replacement board. Please refer: https://www.hddzone.com/hard_drive_pcb_firmware_transfer.html 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!