If your SP becomes corrupt, or you want to reset the SP to the factory default values, you must change the /SP reset_to_defaults setting, then power off the host to implement the changes. This behavior is different than in some past products, where you did not have to power off the host to reset default values to the SP.
You need administrator permissions to perform this task.
-> set /SP reset_to_defaults=value
where value can be:
Removes all of the SP configuration data.
Changes SP and OpenBoot to factory default configuration and clears all SP log files.
-> stop /System -> reset /SP