How to delete the user code in AC100?

To delete the user code:
Step 1: Enter programming mode (Press *, programming code, and # key).
Step 2: Method 1: Press 502, Enter the user code to be delete, and # key.
Method 2: Press 502, Enter the user number of the user code, and # key.
Method 3: To delete all the user codes, press 502, 0000, and # key.
Step 3: Press * to exit programming code.