The most reliable and frequently updated source for NVFlash is TechPowerUp .

Guide to Downloading and Using NVFlash on Windows 7 x64 is the primary command-line utility used to update, backup, and modify the Video BIOS (VBIOS) of NVIDIA graphics cards. While it is a powerful tool for enthusiasts looking to squeeze more performance out of their hardware, it carries a high risk of permanently "bricking" your GPU if used incorrectly. Where to Download NVFlash for Windows 7 x64

: For users attempting to flash a VBIOS from a different manufacturer (e.g., flashing an ASUS BIOS onto an EVGA card), modified versions like nvflashk or versions with "Certificate Checks Bypassed" are often used to override hardware ID mismatches. Key Features of NVFlash NVIDIA NVFlash 5.867 Download | TechPowerUp

: Supports a wide range of modern and legacy NVIDIA GPUs, including the RTX 50, 40, 30, and 20 series, as well as older architectures like Pascal and Turing.