sudo df -h
show system image storage
delete system image
show version
add system image htttp://dl.ubnt.com/something/firmware.tar
add system image tftp://ip-address/firmware.tar
add system image scp://ip-address/firmware.tar
add system image ftp://ip-address/firmware.tar
show system image
Use the set system image default-boot
command to swap the boot images if needed.
Commands taken from https://help.ui.com/hc/en-us/articles/205146110-EdgeMAX-Upgrading