Can I change the master code in command mode? May 11, 2026 11:17 Updated AnswerNo, the printer mode will have to be used to change the master code.Applies ToOM500 Related to Omnilock Related articles Does the master code have to start with 501? OM 100, 300, and 500 User Guides and Instructions Why does my printer print blocks or does not print complete words? My printer is not printing dark enough. Can this be fixed? List of Wi-Q Transactions