Solved by unplugging HDMI stick from TV and power for a minute, the reconnected and held remote close to stick after Roku booted back up.
We lost our roku remote to a behind the TV HDMI stick, model 3800X. The new remote has voice and the four hot buttons are; Netflix, Disney, apply and Paramount. Model RC-GZ1. I aim the remote directly at the HDMI stick for five seconds and nothing happens.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X