Follow these steps:

Download required files:

https://www.techpowerup.com/download/nvidia-nvflash/

https://www.techpowerup.com/vgabios/229426/229426

https://www.techpowerup.com/gpuz/

Save your original bios .rom file using gpuz.

Extract the nvflash and save the msi .rom file in the extracted folder.

Run CMD in Admin mode and navigate the the nvflash folder.

Use  nvflash -6 229426.rom to flash it.

Please be very careful while doing this.