Before manually opening the cable locking mechanism try first to push the cable into the socket. Then connect a car back to the other end of the cable. Try to start the charging (it does not matter if the charging actually starts charging or not). Then release and disconnect the cable from the car end and test if cable is also released from the charger side. You might need to do all the steps couple of times before succeeding. You might also need to push the cable in to the charger socket while releasing it from the car side (if listening closely you can hear the motor moving). If this wont help proceed on the manual release by following steps below. 

1. Disconnect the wallbox from electricity. Usually done from the distribution cabinet feeding the wallbox. 
   Note! If the wallbox unit is equipped with a automatic lock release functionality this will already release the cable from the charging station side (no need to open the front cover). 
2. Open the front cover of the charging station. Use the triangular key that has been shipped with the unit.
   
3. There is a lever on top of the socket assembly attached to the locking motor. By manually rotating this lever you can release the locked cable. 
   This lever can be in red color or gray color depending of the socket used on on the product. 
   Note! In some situations you might need to push the cable pistol in to the socket while manually moving the lever open.
   

Note! Remember to conduct all the work on the wallbox charging station unpowered! 

When manually opening the locking mechanism leave the locking pin in open state before connecting the power back on.