To update your Cisco IMC firmware, review the Catalyst Center release notes for the release that you are installing. The “Supported firmware” section of the release notes lists the Cisco IMC firmware version for your Catalyst Center release.

Then, refer to the Cisco Host Upgrade Utility User Guide for instructions on updating the firmware.

If your deployment uses a three-node cluster configuration, before you update the Cisco IMC firmware, shut down all nodes in the cluster. Alternatively, you can upgrade the nodes individually. Refer to "Common cluster node operations" in the Cisco Catalyst Center High Availability Guide and follow the steps to shut down one or all nodes for maintenance.