unplug front usb
power on
umount /mnt/flash
mkfs.vfat /dev/sda
reboot
plug in usb

cp /mnt/usb1/EOS-4.21.2F.swi /mnt/flash
cp /mnt/usb1/startup-config /mnt/flash
cp /mnt/usb1/zerotouch-config /mnt/flash
boot flash:EOS-4.21.2F.swi


enable
config t
boot system flash:EOS-4.21.2F.swi
write



## FORMAT M2
enable
bash
sudo umount /mnt/drive
sudo mkfs.ext4 /dev/sda
exit
reload (save and confirm changes)
##/mnt/drive will now exist in aboot and EOS


##(below installs EOS to M2, which breaks some commands)
#not recommended
enable
bash
image-install -d /mnt/drive /mnt/usb1/EOS-4.21.2F.swi
reboot