I search a bit and found PIC16F1704.hex but I don't know if this pic file will work because this pic file is dumped from the L3+ hashboard.

You can check the link below. If you are going to use this firmware to try make sure to backup or dump the original hex file first so that you can restore it in the future if it didn't work.

- https://bitcointalk.org/index.php?topic=2383200.msg24343142#msg24343142

Or try to dump the original hex file and flash it with your backup and maybe it can fix your issue.

Do you mind posting the kernel logs here I just curious on how did you know that it was a PIC issue.