This doesn't answer your question directly, but it's a workaround.Use the 'roku 4k tv' profile for streaming to the nu series.At least untill they make the new profile.I have a un75nu7100 and this is working for me for 4k UHD hevc mkv file…

SuperCom - Serial Communication LibraryThe SuperCom Serial Port Communication Library is a programmer's library used to develop serial communication applications.Easily read and write data to the serial port. Send data through the serial p…