Yes, Ive flashed it with an Asus bios (Its XFX) and a stock XFX bios. Both complete successfully, but the card refuses to allow windows to boot. I think as soon as it begins to initialize something in the card makes everything lock up.
Lol this may sound retarded, but...
have you tried to put it in the oven? LOL
a lot of people seem to have success putting defective gpus in the oven for a short time.
That sometimes fixes it and the card works again. Its worth a try if its defective anyway.
Google gpu oven if you don't believe me
Works also with motherboards, recently fixed a motherboard with a defective pcie slot,
put it in the oven at 190 Celsius for 7 minutes, works again
(I shielded the plastic parts with aluminium foil)