Flashing your bios is risky. Flashing your Graphic Card's bios is a double risk and if it goes bad your card won't work and you'll need an old pci graphic card just to attempt a recovery and it may or may not work again (worst case senario). Will I walk you through it, no I won't. I refuse to put myself in a situation that may result in the death of someone else hardware. But I will give you some links.
NvFlash v5.63
nvFlash v5.63 - NVIDIA Firmware Utility download from Guru3D.com
Nvidia Bios Editor v4.3 (Nibitor)
NVIDIA BIOS Editor v4.3 (Nibitor) download from Guru3D.com
This forum has some good info for you to look thru.
Videocards - NVIDIA - Guru3D.com Forums
And this is the only warning I'm giving you regarding the exposed boobies in your avatar. They better not be here the next time I look at this post!!!!