Step down with the B button to -Other settings and confirm again with E (OK).
Press button B until -MDB-Level- is displayed. Confirm again with E.
Now you can change the level with the A and B keys.
Level 3 must be set.
Confirm with E (OK) and exit the menu with the Menu button (press twice).
The vending machine must be switched off and on again once. Please wait a few seconds before turning it back on.
If the device does not have a display with buttons, the change can be made with the HENRI module.