I think you know more about your problem than I do. I have not had a busted BIOS in years.
I do update BIOS regularly. I do usually buy Gigabyte partly to get the dual BIOS -- just in case. But, I've not had to try to replace a broken Gigabyte BIOS.
Having said all that: Can the Gigabyte MB itself transfer the working BIOS from its working BIOS chip to the chip with the bad BIOS -- maybe using a Gigabyte utility or hitting the right key at the right time?? I was ass-u-me-ing that I could do that if I had your problem -- but never checked it.
Just a thought -- maybe not a solution.
Sapphire Pulse RX7900XTX, 3 monitors = 23P (1080p) + SAMSUNG 32" Odyssey Neo G7 1000R curve (4K/2160p) + 23P (1080p), AMD R9-7950X (ARCTIC Liquid Freezer II 420), 64GB RAM@6.0GHz, Gigabyte X670E AORUS MASTER MB, (4x M.2 SSD + 2xSSD + 2xHD) = ~52TB storage, EVGA 1600W PSU, Phanteks Enthoo Pro Full Tower, ASUS RT-AX89X 6000Mbps WiFi router, VKB Gladiator WW2 Stick, Pedals, G.Skill RGB KB, AORUS Thunder M7 Mouse, W11 Pro
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