Is it a Pine64 that is inside the RetroEngine Sigma?

[Squirrel61]

Thanks a lot, that is really useful information! I don't care experimenting a little and finding out things by myself, but I wanted to avoid wasting lots of time on something that will never work nicely.

So Android is the way to go! The Probox remote makes me think of the Wiimote, of which I have a few, so I think I will try linking one to the A64. I don't know however if it can also act as an airmouse, but I will find out!