Ademco 4120OEC Codes

Master Code User 2 (Master Code only changable by downloading)
Secondary Codes User 3 to 8
Duress Code 1 digit above any code, if code is 1234 Duress is 1235)

Add Code Master Code + 8 + User (3 to 8) + New Code (Keypad should give 1 beep)
Erase Code Master Code + 8 + User (3 to 8) + Master Code (Keypad should give 1 beep)
After above commands keypad should beep indicating successful, if not try again
You cannot pause more than 2 seconds while entering below commands or it won’t work