Integra just put out a Firmware upgrade last night for this unit. The notes state that this is to correct some issues with HDMI extenders and to enable the unit to work well with the Onkyo Android application. There is no mention of any other fixes. I did the update via the network option. It takes about 15 mintues total. In the end, the 80.3 display says completed! and just sits there... it does not reboot, nor respond to any remote commands. I finally turned it off then on via the power button on the front. It looks like the firmware update occurred but that is a very poor way to finalize a firmware update as we are always told to never use the power button during an update of this nature.
A call to Integra/Onkyo support was fruitless as usual. They were not even aware that a firmware update was available, nor what it was for, nor what to do upon a "completed!" message.
I have no further information on the Audyssey/Bi-amp bug nor any on the limitation of pcm above 16Mbps