Just a note re if others run into problems in the upload of the firmware (as I had), wherein I encountered the Data Error message.

Multiple toggles of the master power switch eventually did correct the problem, concurrent with closing ALL background programs.

If the above is done, it is likely that the upgrade will indeed progress fine.

I think the problems I ran into relate to not following meticulously the above points.

BTW, the firmware changes I found to be quite useful, especially the naming of the audio inputs, and the non-toggle of the 7.1 mode.