Will A Universal Remote Work With Your Roku TV? - SlashGear
Briefly

It's worth noting that your universal, cable, or satellite remote may not replicate all the buttons of your Roku remote. Depending on the model, you might get basic or expanded support. Basic button support includes controls for power, volume, and input, while expanded support adds controls like up, down, back, forward, home, replay, play/pause, options, and scan.
The specific steps to program a universal remote vary by brand, but they're broadly the same. Once you're ready to set up a universal remote with your Roku device, go to Roku's website and make a note of the codes provided for your universal remote. Next, follow these steps to connect the remote: Power on your Roku device and TV. Press and hold the setup button on the remote. Select the device you want to program. In this case, choose TV. Enter the remote code.
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