OK, I was on 5.4.2.1 now on latest 5.4.4.2.
I was on 1.0,0,1 firmware, now on 1.0,3.2.
Immediately I see the mic from the MTRXst rear panel deflecting!
No DA metering yet, but one step closer!
Once the unit restarted after firmware update, the drum loop in pro tools that was playing played out over my surround speakers - but only for about 1.5 seconds, then stopped.
Feel so close . . .