If your AP is disconnected or stuck in an "Adopting" loop, SSH is the most reliable way to force an update.
Ubiquiti offers two primary paths for deploying firmware: automated updates via the UniFi Network Application or manual deployment via SSH for isolated environments. u6lr latest firmware
STUN communication errors between the AP and the controller after rebooting into the new firmware. If your AP is disconnected or stuck in
If your U6-LR refuses to update or goes into a boot loop: u6lr latest firmware