Yesterday I help my friend setup his Unifi with the Dlink DIR-850L.

Luckily I found this thread as there is NO WAY it can be setup with the firmware 1.22.

We tried manual internet setup, auto setup everything but the DSL light will not go online.

Found this thread and went to Dlink website to downgrade the firmware to 1.09 SG and follow the instructions as provided by nomar and immediately it goes online.