You're try to pair the original remote that came with it or a new remote you bought? The roku xs uses a bluetooth remote, the current remotes with pairing buttons are wifi-direct completely incompatible. The xs remote had blue and green key with two dots below them, and was bluetooth. The roku 3 wifi remote looked alot like the that one but only had one dot, the roku remote with one dot will not work on the xs.
Mine also. I've tried everything. New batteries, turning off and on. I'm on the homescreen and when I put the remote up to the box, the box flashes and takes me to the remote screen but if I push a button it goes right back to the home screen.
Please be aware that the Roku 2 XS is a much older device.
However, we would be happy to see what we can do to help get you back up and running.
Please feel free to send me a PM with your Roku account email address and the serial number of your Roku device (printed on the side/back of the device) and I'll have our support team reach out directly to assist you further.