@MikeKS-
HDCP 2.2 is required for 4K content. Your Roku will determine what HDCP version is present on your TV. If you attempt to play 4K content to a tv with HDCP 2.0, Roku will serve the program in HD (720i or 1080i depending on your set's capabilities).
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
