The Self Update feature allows you to expand Enterprise Manager's capabilities by updating Enterprise Manager components whenever new or updated features become available. Updated plug-ins are made available through the Enterprise Manager Store, an external site that is periodically checked by Enterprise Manager Cloud Control to obtain information about updates ready for download. See the "Updating Cloud Control" chapter in the Oracle Enterprise Manager Cloud Control Administrator's Guide for steps to update the plug-in:
http://docs.oracle.com/cd/E24628_01/doc.121/e24473/self_update.htm