I also had some trouble with BIOS flashing on my Gigabyte X670 motherboard. I can't remember the specifics but at one point my display output stopped working so

I also had some trouble with BIOS flashing on my Gigabyte X670 motherboard. I can't remember the specifics but at one point my display output stopped working so I tried to update with BIOS flashback since the update was supposed to improve memory stability. The first attempt failed. The flashback light stopped and I waited several minutes. A second flashback attempt worked. Pretty nerve-racking because they tell you to never ever ever interrupt the flashing process. The X670 platform was a bit under-baked, in my opinion. There were a lot of strange issues, especially with memory reliability. It took until a BIOS update in January for me to be able to reliably run at DDR5-6000 CL30 with a memory kit that was on the QVL and was marketed as EXPO AMD Compatible. Yes, it's AMD's first iteration with a new socket and DDR5 but meanwhile Intel has been running reliably at DDR5 7200, and AMD still can't do that. Leaves a bad taste in the mouth especially when $250 is now "low-end" for AMD motherboards.