Hi @Anonymous User
Haven't seen a flashing yellow light before, where if you take the back cover on the smart stick remote and press the small button the light will flash green where it will attempt to pair up with the stick.
Perhaps the yellow light means the batteries are running low ?
Maybe try following this help guide linked below to see if you can get the remote controller working again on the stick.
https://help.nowtv.com/article/remote-control-troubleshooting
