[Kodroid]

Please see the ETA I just added to my message before yours. My problem at least seems to have magically solved itself.

I tried numerous restarts and power cycles but it didn't change anything for me. Audio passthrough still gives me no sound at all, the receiver doesn't seem to receive anything soundwise... The only thing I can see is that you are on Matrix beta 1 and I'm on 18.9, maybe I'll try installing the beta version to see if that works...

Tried installating Matrix beta 1 and it's half a fix, if I choose AudioTrack(IEC), Kodi IEC packer as the passthrough outpout device, I get basically the same result as 18.9 no sound at all on most files and pcm on some. But if I choose AudioTrack(RAW), Android IEC packer then passthrough works fine with AC3 and E-AC3 files but is very buggy with dts and dts-hd ma files I either get pcm after a while or the firestick reboots... Well at least I can have passthrough working on AC3 and E-AC3.

These reports make it sound like Kodi needs to completely overhaul the playback backend to keep up with the latest Android media developments.