You can't really brick GPUs, at least I failed to do so trying to flash the wrong BIOS or even when I restarted a frozen rig mid BIOS update. But then again I only ever used the DOS version of NVFlash (which you can use to list your cards and also you have to specify which card you want to flash).
Can you be so kind then to tell me how can I make my PC recognize all of my 280x? I got 5 of them that are completely bricked/dead (No signs of getting detected by the OS). When I look at device manager it only says standard VGA and it won't let me install drivers on them.
Are they xfx cards? Specifically speaking the amd models?
To be frank, your issue is a common one to a failed card needing warranty.
Xfx takes the cake on that note. I'll never buy their products again.
If you are using a card to view the OS, but it can't be detected as anything but generic vga; it's a problem most likely not with the rom.
They are Gigabyte. Started dying one by one, as months went by. Its a shame they are over 3 years old. I believe Gigabyte covers up to 2. I once had a dead XFX 380, but they replaced immediately.. Haven't had any issues with my XFX 390s besides them running really hot all the time.