@Blurone -
A replacement remote that will work with Roku TVs from any manufacturer is available from Roku for about ten bucks.
https://www.roku.com/products/accessories/roku-tv-remote
You might also find it at various retailers.
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.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X