I have a processor from nad that occasionally gets a firmware update. You hook up the Ethernet to The processor and commence an update.
Why is McIntosh making this so difficult? And maybe the need for the firmware update ain't really necessary.
Apple keeps updating their iPad continuously for all kinds of complicated crap nobody uses and it serves too slow up the processing Power of an iPad. But you gotta do it because of security so you always at the mercy of the update process. Although an audio component doesn't rise to this level of security concern.
My dog never needs a firmware update.