My Roku 4K+ remote will not pair with my tv. When it tells me to enter the tv brand, it doesn’t matter what letter I type, it says unknown. So, I can’t control the volume nor the on/off for the tv. I have to use the tv remote for that and the Roku remote to change channels. Not what I expected.
Some have reported that by connecting to another network while setting up their remote for their TV, for instance their phone's wifi hotspot, it enables the TV brand to be recognized so the setup can complete. Once the remote is successfully set up for the TV, you can then return to your normal home network.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X