@kaz26 I tried to flash vbios with NVFlash version 5.792.0, there are two versions of NVFlash, for 32 and 64 bit systems, I have 64 bit windows. I also used --protectoff.
When I flash via nvflash64 I get an error (that I'm using the 32-bit version of the program on 64-bit windows).
nvflash32 works without errors, but the result hasn't changed since my last post. When flashing, the screen does not blink, the firmware takes 1-2 seconds, after the firmware, the old and new versions of vbios are not displayed in cmd, after rebooting the vbios, a drain remains.
Maybe try flashing vbios via DOS?