Of course make sure you create a backup of your original bios!
NVFlash needs to be used in DOS mode, when you boot your system. Thus use a MS-DOS bootdisk and just copy this tool on it.
Make backups with the following command (in dos): nvflash -b filename.bin
Flash your bios with: nvflash -f filename.bin
Use at your own risk, only flash when it's absolutely necessary.
Supported Cards:
Geforce 6 Serie & SLI series ! Quadro Serie (4.42) GeForceFx Serie (4.42) GeForce4 Ti 4200-8X / GeForce4 MX 440-8X GeForce4 Ti 4600 / GeForce4 Ti 4400 GeForce4 MX 460 / GeForce4 MX 440 SE GeForce4 MX 440 / GeForce4 MX 420 GeForce3 Ti 500 / GeForce3 Ti 200 / GeForce2 Ti GeForce3 / GeForce2 ULTRA
Note:
If you have problems downloading NvFlash Tool 5.13,
please try to stop using your download manager
and avoid right clicking on files. Also, check
your firewall settings, because some mirrors may
require that you do not block the HTTP
referrers. 
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