The install.bin -uninstall command launches the Hardware Management Pack Installer, not the Uninstaller.
Workaround
Use the following commands to launch the Uninstaller:
For Oracle Solaris OS or Linux systems:
/opt/ssm_directory/setup/uninstall
Where ssm_directory is either sun-ssm or ssm, depending on your version of Oracle Hardware Management Pack.
For Windows systems:
C:\Program Files (x86)\Oracle\Oracle Hardware Management Pack\setup\uninstall.exe