If your card has a physical "Dual BIOS" switch, ensure it is set to the position you wish to flash. This also provides a safety net if one BIOS becomes corrupted. How To Vbios Flash An Nvidia Graphics Card
This is a primary source for the latest Windows-compatible builds. download nvflash
Open Command Prompt as Admin and navigate to your folder using cd C:\nvflash . If your card has a physical "Dual BIOS"
Before any update, create a safety copy of your current firmware. such as C:\nvflash .
Download the utility and place the files in a dedicated folder, such as C:\nvflash .