I posted this already in the Kodi forum but maybe somebody can help me here since this thread is more HW related 
Sooo I received my U9 today, the setup was very easy and got LE running within 5 min.
@wrxtasy I can't get Dolby Atmos running, passthrough is enabled but my AVR shows just DTSHD or DD+ but no Dolby Atmos any Idea?
I Got it working i messed the AVR settings up...