Hi Dave,
There are two sets of firmware for the Airlens.
You have updated the AirLens firmware to 2.7.0.
Your Streamer (aka “Core” or “CDM”) firmware is not up to date. What PSAudio call Streamer firmware is the firmware for the ConverseDigital board inside the Airlens.
The procedure to update the Streamer firmware is documented in the manual.
In short: DIP 7 OFF, Press WPS for 15 seconds. Update will occur. DIP 7 ON. Reboot.
As others have mentioned, it is also possible to update the Streamer firmware using ConverseDigital software called MConnect.
This is not documented in the manual, nor do PSAudio recommend you do Streamer updates this way.