BIOS update file issue

[pak_0.ln158902e5]

Hello everyone, I have a B450-A PRO MAX and I would like to update my BIOS for a new processor. But when I download the update file on a formatted key, my BIOS can't find the file. What should I do?
Thanks

 

[Svet]

>>Posting Guide<<
What's current BIOS, which BIOS you trying to flash?