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. Of course make sure you create a backup of your original bios.
Note:
If you have problems downloading NVFlash 5.77,
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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