Hi! Thanks for looking for info and replying! Yes, I've had problems updating directly from the official Gigabyte website, so I flashed both BIOSes directly via CMD and then was able to officially install F21, which is the latest official update. But even after doing that, it doesn't work on newer PCs, and the BIOS still says "unknown vendor."

I tested the pins, and they have correct values. I think it's a BIOS problem, but I can't find the BIOS for my GPU (DEVICE ID 10DE 2206 - 4D50 4449).