Why don't you use another arch computer to dump the usb key content into a file, you won't have to wonder if it got modified by a BIOS.
A raspberry pi or any other such SBCs will do just fine for that. Plug it in, dump it without mounting any eventual partitions, and you're done. You can derive from threre for other interfaces like SATA... -- Vincent Legoll -- coreboot mailing list: coreboot@coreboot.org https://mail.coreboot.org/mailman/listinfo/coreboot
