Hey,
sorry this post is probably already outdated for the majority of you guys out there; but maybe for some good (performance or stability) reason you might prefer to run some Ubiquiti equipment with the rock stable old v3.6.1, v5.2.1 or v5.3 firmware.
Based on the UBNT SDK published during that date I’ve compiled some of these preferred old firmware versions including the skynet security patch (and some other stability patches) which you may download at https://4ufiles.flo.sh/ubnt/.
You may find some more useful information on this topic using this link to the Ubiquiti user community forum.
Have fun,
-Flo
