Just quizical info here.
I do NOT have a 4K tv.
BUT
Last Olympics (and the nature 4K stuff) the H3 allowed down converted feed to my 1080 tv.
The extra noncompressed bandwidth made exceptional picture.
Throughout this past college football season, we enjoyed watching the noncompressed 540 4K games at 1080.
Even comparing FS1 to 540 to observe the extent of degredation of compression in the 'regular' hd channels.
So...
There has been no equipment change from then till now.
Why could the H3 previously pass/down-convert the 4K to our 1080 tv, but now cannot?
Artificial equipment verification block imposed by Dish?
Side note,
guide shows the 4K channel,
Pressing select to setup a timer brings incompatible message,
Pressing record button (below pause button) on remote allows initiating timer setup.
I have set timer to record all new and rerun programs on the 4K channel.
I don't have much of am expectation to watch them,
Expecting incompatible message on dvr/play attemp.
BUT, can't hurt to try.