The Cisco Host Upgrade Utility (hereafter referred to as Cisco HUU) is a tool that you can use to upgrade or downgrade a firmware on various components on Cisco UCS C-Series and S-Series servers.

The Cisco HUU provides an user interface using which you can choose a hardware component that needs a firmware update. Beginning with the release 4.3, the Cisco HUU user interface is updated with new options. Cisco recommends you to use this guide to familiarize yourself with the new interface.

For information about the components supported and their firmware versions for various servers in a release, see the Firmware Version Listing and Internal Dependencies for Cisco IMC Releases.