I have a DTRT4000.
Still missing the Amazon app as expected - and the Netflix app will not give 5.1 however I connect it and to whatever. Both other stories.
In the 'Software Information' - if I do 'Update Software' it says up to date - fine.
If I select 'Update players and apps' it says "We can't update you please and apps - please try later" - has done this for weeks.
Amazon app have look here
Netflix have a look here
Update Players and apps have a look here