Re: Nvidia Video Card Firmware..
In general the video bios is only used to initialize the videocard and system startup. Further the drivers use it as a source of information (about clockspeeds, voltages ...)
The problems you are seeing aren't related to the bios. In some rare cases the bios contains a bug which for instance doesn't initialize one of its outputs correctly so lets say the DVI-output or whatever doesn't work at system startup.