Can you connect the Xbox Series X with a 2.0 HDMI cable to only play full hd?
The HDMI2.0 cable doesn't care whether you send 4k or 1k through.
Yes, you can do that and without any problems.
The bandwidth is even larger and more image information can be reproduced, for example if you want to switch on HDR or 120fps, that's no problem
Of course…