Are you running the latest firmware? They have fixed the chromecast issues.
You dont have to do a factory reset, just switch it off on the main power switch. Make sure you have turned down your subwoofer first or it will pop big time.
Been trying again all morning and I can’t get the amp and tv to work correctly over hdmi, I have tried a different cable my tv has ARC but not eARC. tried everything combination in the hdmi settings on the amp. Totally fed up with this issue now.
Make sure to unplug the power from both TV and Arcam. When I had the AV40 I did have to also pull the TV power to get the handshake to completely reset.
Yes I have tried this multiple times thanks but i cant get it to work. After a factory reset do you change the CEC control to output 1 and leave everything else alone? I have ordered a new HDMI 8k cable too.