Do you have a question about the Mauer ESL-CAM and is the answer not in the manual?
Turn the handle to physically close and lock the mechanism.
Input your 4-digit personal access code.
Input '7' followed by the factory master code '1-2-3-4-5-6'.
Lock unlocks; green LED stays on for 10 sec, handle can be turned.
Replace the master code by activating master mode and entering a new 6-digit code.