@sabih just curious what were your expectations for the firmware update? Why were you looking to do it?
As to McIntosh customer service, it’s definitely not the best even when it comes to warranty repair but in case of firmware updates, I side with them. I see on a daily basis how many people can’t understand elementary concepts. Arming them with a flash drive loaded with a firmware update is just too dangerous. I do agree that they should offer the firmware updates thru the local dealer network.