For my Dell 15 3585 (AMD Ryzen 5 2500u), I downloaded the latest BIOS from Dell's website and put it on a USB stick. The issue is that when I try to select the file from the BIOS Flash Update, it tells me 'Invalid File!'. I have no idea about why.

I have tried using different USBs, downloading the file again, disabling Intel Virtualization (as suggested in some other posts).. But no luck.

Any help is appreciated.