Cannot flash bios: "Not Found"


I just received my up squared after kickstarting it a long time ago, and I am excited to start using it. However, I cannot for the life of me flash the BIOS. If I select "Launch EFI Shell from filesystem device" I get "Not Found". My USB stick is plugged in on startup, and contains the contents of the upa1am21 folder.

The USB stick is formatted to FAT32.

Would could be the problem?