The buttons of my remote control do to respond
The built-in battery of the remote control might be running low, in this case, use the micro-USB cable to charge your remote control. Your remote control is still charging as long as the blue LED is on. As soon as it's off, your remote control is fully charged.
Your remote control might not be paired any more. Press the TV button and BACK button, wait 3 seconds then release to unpair the remote control.
To pair it again to your Movie Cube, press the TV button and OK button, wait 3 seconds then release. You should see a "Pairing successful" notification on the screen. If not, please repeat the process