3Com NBX 2102 IP Phone "unlock maps" Questions

...message trying to reset button mappings on a 3C1022 phone. The phone is part of a phone group with unlocked buttons. "unable to save changes.Invalid data has been entered or required data is ...

How do I unlock my GXP 1450? Step 1: Press "OK" button to bring up the keypad configuration menu, select "Config", press "OK" to enter submenu, select "Factory Reset" Step 2: Enter the MAC address ...