@well0nez I didn't even think about that. When I made the original post almost two years ago, AI was much less capable than today. You just gave me a few ideas for different projects.
As I said, unfortunately I don't have the HY300 anymore, but I do have a Magcubic L018(same chip I think), though it's in use every day as a bedroom TV. I don't think my girlfriend would appreciate if I started to hack it 😉 Especially if core functions like projecting the things coming through the HDMI port to the wall.
The L018 has worse software than the HY300, in my opinion, so I've connected it to a certified Android TV 14 Box.