Hi Karen,
For app user you can use the following CLI command
utils reset_application_ui_administrator_password
For OS and security passwords, the procedure is documented here
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/connection/10x/os_administration/guide/10xcucosagx/10xcucosag020.html#pgfId-1053218
Manish
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