Sometime when you trying update Ubiquiti UniFi AP old firmware updating status may stuck in Network Management Controller GUI. And UniFi AP keeps rebooting.
To Fix Ubiquiti Stuck Updating problem we need manual upgrade UniFi firmware.
Reset UniFi AP
Sometime when you trying update Ubiquiti UniFi AP old firmware updating status may stuck in Network Management Controller GUI. And UniFi AP keeps rebooting.
To Fix Ubiquiti Stuck Updating problem we need manual upgrade UniFi firmware.
Reset UniFi AP
To hard reset UniFi AP to factory default, connect UniFi an then press and hold the reset button for 10 seconds until LEDs stop glowing and release button.
Manual upgrade Ubiquiti UniFi AP firmware
SSH into UniFi with using any SSH client.
Ubiquiti UniFi AP default SSH login and password:
username:
ubnt
password:
ubnt
After download newer firmware and upgrade UniFi AP
# cd /tmp # wget https://dl.ubnt.com/unifi/firmware/BZ2/4.0.15.9872/BZ.ar7240.v4.0.15.9872.181229.0259.bin --no-check-certificate # mv BZ.ar7240.v4.0.15.9872.181229.0259.bin fwupdate.bin # syswrapper.sh upgrade2 &

Hi,
Thanks for the post, it did help me manually update my AP. I ran into the unable to update problem when I was installing my first Unifi devices. I later found that the failure to update problem was caused by ports that were not open on the Windows firewall on the computer running the Unifi Controller. This is a link to the article on the required ports:
https://help.ubnt.com/hc/en-us/articles/218506997-UniFi-Ports-Used
Thanks,
Cindy