I have an old Yamaha av paired to a new Optoma uhd38x projector and a version 1 apple 4k tv. The projector claims 4k but I’m getting 1920x idk. I think it’s 1080p. It is extremely clear but not 4k as advertised. I’m thinking the av doesn’t support it. Same w the Apple TV … no option for 4k resolution settings. Thoughts ideas advice is welcomed. Thnx