I saw the same thing. I was hoping that someone had upgraded & then would tell us what it did/or not.
edit: Ok, I'm going for it. It is telling me to "Please wait...Authenticating" at this time. It also said the whole process would take 6 mintes & that the gui would shut off when it was done. What happened was, that my receiver rebooted & then proceeded to start updating the downloaded file (there is no file downloading idication) with a 6 min countdown. After 2 minutes (4 minutes left to go) the display on the reciever changed to "Updating' & it started counting up from 0 to 100%. When that finished the receiver rebooted & my TV came back on with the sound muted (but NOT on mute). I checked here but there is no mention of the 3311. I have no idea what this firware update did/does.
So lovswr, did you have to re-do the Audyessy set-up after updating the firmware?