Download NVidia nVFlash firmware update app for NVidia BIOS
nVFlash is the NVidia official firmware / BIOS updater, providing also some more options to help you keep your video card healthy and powerful.
If you have not used nVFlash before, make sure you read carefully the instructions how to flash the BIOS. You can flash a newer or an older BIOS version, in case that you need to downgrade.
As always, create first a backup of your BIOS that you will be able to restore if something goes wrong with the BIOS version you are trying to flash.
Note that nVFlash cannot overclock your card, just update the BIOS or compare firmware, and similar options.