HP MIBs can be unregistered using the command line. The command line interface (CLI) is the same for all CMS types to include Windows, Linux, and HP-UX.
To unregister a MIB from HP SIM:
Open an MS-DOS window or UNIX shell.
Run mxmib -d file.mib to unregister the MIB in HP Systems Insight Manager (HP SIM).