For trunk lid unlocking from outer side, insert the main key and turn it clockwise.
For closing of a trunk lid lower it and press it down. After closing of a cover of a luggage carrier / a back door try to pull it up and be convinced that it is reliably locked.
Prevention
During driving hold a luggage carrier cover / a back door of the closed.
Lever of removal of fixing
For trunk lid unlocking from a seat of the driver, pull up the lever of removal of fixing.