I have a wide range of Roku TV's and streaming devices. Two of them I use regularly, a 2018 4660X2 Roku Ultra connected to an LG tv in my bedroom and a 4802X in my den connected to a Samsung TV and both used the CEC connection to control them for YEARS, then one day blammo! They both quit controlling the TV's and I had to switch both of them over to IR to make them work, so CLEARLY, Roku made some changes to their firmware that impacted the CEC functionality. And by the way, I have a Denon AVR connected to the Roku and it identifies it, and the Denon identifies the Roku through the CEC. Additionally even though the CEC no longer works, for some reason the both of Roku's still identify the Samsung and LG correctly, so they are still talking to each other, they just aren't being controlled anymore. If you need any more information regarding CEC and the communications, Pulse Eight has an adapter that connects and reads the CEC comm's on the HDMI connection so you can see what is going on. Cheers!