Most cards can be flashed blind, or with the aid of a second card, even if you throughly rape the BIOS. I've erased BIOSes, flashed ones that weren't even remotely designed for the same type of card, and had power failures mid-flash...always been able to make the cards work again.
...rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law,' because law is often but the tyrant's will, and always so when it violates the right of an individual. -- Thomas Jefferson