Factory FW Backup for Unifi AC Lite
On device:
$ for i in 0 1 2 3 4 5 6 7 8 9; do cat /dev/mtdblock$i > /tmp/mtdblk$i; done
$ printf '%s\n' sys proc dev/pts > /tmp/exclude
On host:
$ ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -l ubnt fd97:c4fe:a1a:0:7a8a:20ff:fe80:d6bd tar -cv -X /tmp/exclude / > root.tar
LEDE/OpenWrt Install
On host:
$ wget http://downloads.lede-project.org/releases/17.01.4/targets/ar71xx/generic/lede-17.01.4-ar71xx-generic-ubnt-unifiac-lite-squashfs-sysupgrade.bin
$ scp lede-17.01.4-ar71xx-generic-ubnt-unifiac-lite-squashfs-sysupgrade.bin 'ubnt@[fd97:c4fe:a1a:0:7a8a:20ff:fe80:d6bd]:/tmp'
$ ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -l ubnt fd97:c4fe:a1a:0:7a8a:20ff:fe80:d6bd mtd write /tmp/lede-17.01.4-ar71xx-generic-ubnt-unifiac-lite-squashfs-sysupgrade.bin kernel0
$ ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -l ubnt fd97:c4fe:a1a:0:7a8a:20ff:fe80:d6bd mtd write -r /tmp/lede-17.01.4-ar71xx-generic-ubnt-unifiac-lite-squashfs-sysupgrade.bin kernel1