Help. New tv box, no sound

New M8S/s812 from GooBang Doo on amazon. Can't get sound from it at all, not just from kodi, the whole box. No support at all, so far, from vendor. Tried everything i could think of, but I am new at this. Setup is M8S connected to home theatre and then the TV as monitor, both via HDMI. I have tried bypassing the home theatre direct to tv with no difference. Yes, volume is up, no mutes. I have tried different HDMI cable to eliminate that possibility, no difference. (I can get sound from the home theatre using other input devices). I have tried Stereo settings on box as well as 5.1 without success.
Relevant box/system settings are:

• Volume on unit is at max.
  
• Display: HDMI auto-detect
• Digital audio auto-detect ON
• Digital audio Output (greyed out), HDMI passthrough

Any help/suggestions would be most appreciated. What did I miss ?

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Help. New tv box, no sound