I have a Sony TV & a Sony 5.1 HTIB. Audio is automatically output to the HTIB receiver & I can switch on/off both TV & receiver simultaneously with 1 remote. I believe this is called ARC

I installed unifi recently & got the HyppTV STB. When the STB is plugged into my system, it messes up the link between the TV & HTIB receiver. I get a "communication error" msg & all audio (astro/BR player/HyppTV STB) goes to the TV speakers. The on/off switch also no longer switches on/off both TV & receiver. When the HyppTV STB disconnected, everything goes back to normal. WTF??!!. Any sifu can help?

1 hdmi cable between tv & receiver (arc)
receiver hdmi input #1 - astro
receiver hdmi input #2 - br player
receiver hdmi input #3 - hypptv stb

After googling, the solution seems to be a "CEC-less or non-CEC hdmi adapter". Alternatively, buy a cheap hdmi cable & remove pin 13 from the hdmi plug. I'm gonna try that later & let you know how it goes

SUCCESS! Confirm remove or disable pin 13 of the hdmi plug solves the problem.

I bought a cheap china hdmi cable, cracked open one end of the plug & cut the wire to pin 13. Not elegant but it works. Google for diagram of the pin location