Navigate to Admin | Firmware | Controller Firmware.
From the Actions menu, select Controller Upgrade.
Select the new firmware version from the dropdown and choose when to apply the new policy (either Apply Now or Apply Later).
Click on Submit. Once you do, the status window will show the progress. Controllers will be upgraded serially so that the fabric will be fully operational during the upgrade procedure. Each APIC will take around 10 minutes to upgrade, and each will reboot during the procedure. After the upgraded controller reboots, it will rejoin the cluster and the next controller will start to upgrade.
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