If memory serves me well when I updated my Asus motherboard with a usb all it asks for updating the bios is the location of the file. Your usb should pop up on the list and select it, within it the only file should be the .rom file for the bios. Best if you get your best USB, not size wise but brand name, format it under windows and select it it to be fat/fat 32 which is recognized by most motherboards. You also have the option of backing up your current bios if something happens on to the usb prior to installing the new bios. I remember some of my cheap chinese USBs not showing up in the bios but my lexar 8gb one did.