Last time I remember... A video card doesn't really need a Bios update to run it, usually the only thing you need a Bios update for is to install a new CPU... Hmm, interesting however... Does your 7750 work again if you put it back in?
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850