To remove your Smilio terminal from a vertical support, you have to be equipped with a thin and robust cable (iron wire or fishing line).
Unroll a sufficient length to tighten the wire and pass it behind the device (start on the top of the box). Then, make lateral moves (back and forth movements) in order to saw the resin located between the wall and the Smilio terminal.
Repeat the movement until you have completely removed the terminal from its adhesive part (ensure that it does not fall at the end).
If there are still some traces of adhesive on your wall, they can easily be removed with a clean cloth and surgical spirit. (90° of alcohol).