Having issues with your DietPi installation, or, found a bug? Post it here.
5.1 HDMI passthrough does not seem to work on the XU4 - I have researched this in the Odroid forums. All I can get with acceptable quality (putting the sound through an Onkyo receiver) is stereo. I have tried it with Kodi on Dietpi, Odrobian and Android - same result. I have read it does work on the C2 with Libreelec so I have ordered one. In the meantime my Pi2 and Pi3 are better for kodi but the C2 promises to be betters till.