As with all of the original owners I received my Aeros with 2.2. While I have good WiFi in my upstairs music room, it apparently was not good enough for Aeros. It continued to show WiFi connected but gave no indication an update was available. After reading about 2.7, I decided I needed to take action. I took the Aeros downstairs to the WiFi hub. Plugged it in down there and voila, there was the update option. It downloaded quickly. The install seemed to stall at 98% but eventually, after a minute or two, it did complete and reboot.
It seems proximity to a strong WiFi signal is requisite for a firmware update.