Thanks for the response,
If the remote is not working, you can try a few other steps to resolve the issue. First, try using a different remote if you have one available, as the remote may be faulty. If that doesn't work, try resetting the remote by removing the batteries, waiting for 10 seconds, and then putting the batteries back in. You may also try to restart your Roku TV by unplugging it from the power source and plugging it back in then try again.
For additional troubleshooting, you may also refer to this link: How to fix your Roku voice or simple remote that is not working
If none of these steps resolve the issue, I'd suggest contacting the TV manufacturer to inquire further. And to see what options or suggestions they can provide. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.
You can reach them here: Hisense Support and TCL Support