Update the VMware ESXi Software
The VMware ESXi installation media might not contain the most up-to-date versions of the software. If necessary, update the VMware ESXi software with the latest updates and patches.
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Determine whether updates for your installation are available from the VMware ESXi download web site at http://support.vmware.com/selfsupport/download/.
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Refer to the VMware ESXi documentation at http://pubs.vmware.com/vsphere-55/index.jsp to complete the update installation.