U can check from here for full version!
My system running Ubuntu & remember that Backup first!
rm unifi-update.sh &> /dev/null; wget https://get.glennr.nl/unifi/update/unifi-update.sh --no-check-certificate && bash unifi-update.sh
It’s take around 25′ min for upgraded to 8.0.28, and maybe 3 min for reconnect APs from all sites!
Jax VN 