Generally you would only do a BIOS update to fix a problem. A video card would only need an update to try to unlock some hardware or to do some extreme overclocking.
I am really not trying to be hard on you just rack it up as a lesson learned. You screw up any aspect of a BIOS update for just about any device and you have "bricked" the device a term made up especially for bad updates. Not something to play with unless you are sure what you are trying to do.