Use offline update to mount an ISO to all nodes in a group and then reset the nodes to boot from the ISO and perform an offline update.
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From the Scalable Update screen, click Actions → Offline Review/Deploy.
HP SUM displays the iLO Federation group name and Interface iLO.
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In the ISO Image box enter the URL of an ISO image that is available by HTTP on the network.
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In the Filtering section, select the servers you want HP SUM to power off and deploy components.