This step requires a host PC running Linux.
download Download the required disk image file
Connect a USB thumb drive to your pc
Run command:
lsblk
Identify your drive (usually /dev/sdX, X can be different for each system)
NOTE: SATA HDDs & SSDs also identify as sdX so be careful not to corrupt your data.
unmount Unmount your drive from the system
ususally will be: sudoif mounted using
umount
Run command:
sudo dd if=${path/to/image/file} of=/dev/sdX bs=1M status=progress; sync
Wait until dd finishes and you get a prompt again, safely eject the USB drive.