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Unable to open BIOS Signature file

HP Recommended
Pavilion 790 TPC-W051-MT
Microsoft Windows 10 (64-bit)

Trying to follow to fix known HP/Microsoft screw-up that has bricked my desktop. Downloaded new bios softpak and followed all directions. Set up USB with fix. Went through BIOS menus as described in fix. When I tell it to install, I get: The System BIOS update failed. Unable to open BIOS Signature file."  I double-checked. The signature file is there in the same directory as the BIN file, just like it's supposed to be. So now what? 

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