I'm having the exact same issue as multiple people like Thor2020, dlm12007, ppeluso1, etc.
My EVGA 2080 Ti XC Black 11G-P4-2282-KR will not update as it spits some error and a message about needing a newer version of NVFlash.
I'm clueless as to the link Sajin posted as that seems like just a generic version of NVFlash on it's own rather than having the bios of the EVGA 2080 Ti XC Black 11G-P4-2282-KR built into the NVFlash program like what EVGA provided (OP). Also, the NVFlash in Sajin's link requires all sorts of commands and manual typing whereas the program EVGA linked to here is supposed to automatically install upon double-clicking the file.
Can someone please help? I'm having strange issues with my EVGA 2080 Ti XC Black 11G-P4-2282-KR and need to see if updating the bios helps.