Management Extension updates are included in each Cisco UCS Manager update. Unless otherwise instructed by Cisco Technical Support, you only need to activate the Management Extension update after you've downloaded, updated, and activated an Cisco UCS Infrastructure
Management Extensions enable you to add support for previously unsupported servers and other hardware to Cisco UCS Manager. For example, you may need to activate a Management Extension if you want to add a new, previously unsupported server to an existing Cisco UCS domain.
The Management Extension image contains the images, information, and firmware required by Cisco UCS Manager to be able to manage the new hardware.
Cisco UCS Manager may need to access a Management Extension when you activate. Therefore, the Management Extension is locked during the activation and update process.