I'm now using Serenity on my Fire TV, because I don't like the design of Kodi and the official Plex app. So far it works great with the MX Player.
There is just one problem which I can't get rid of.
When I start a movie or an TV-episode there is no sound. I have to choose an audio track manually and then it works as it should. Serenity even remembers the track.
I already set a default sound language in the MX Player app, but this doesn't work.
Do you have any ideas how i could change this setting?
Edit: Nevermind. I don't know why, but it works now.