BTW, it isn't even necessary to make a bootable USB! If you have a working 
GNU/Linux OS on your libreboot machine, then just download Debian's live iso to 
your machine, put an entry like this somewhere in your grub.cfg, reboot, and 
select it from the grub menu. Worked like a charm for me.

Obviously:
1. change the path and filename in "set isofile" to match your filename and 
where you put it, and
2. change the partition in "fromiso" as appropriate.

menuentry 'Debian live iso in my home folder' {
        set 
isofile='/home/bruno/Downloads/debian-live-8.3.0-amd64-mate-desktop.iso'
        loopback loop $isofile
        linux (loop)/live/vmlinuz boot=live config fromiso=/dev/sda4/$isofile
        initrd (loop)/live/initrd.img
}

Enjoy!

ref: 
https://wiki.archlinux.org/index.php/Multiboot_USB_drive#Live_install_medium

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