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HOW TO: Upgrade from VMware vSphere Hypervisor ESXi 5.1 to VMware vSphere Hypervisor ESXi 5.5 for FREE
It's the same procedure and process, as upgrading from 5.1!
You need to make sure that your servers are certified for 5.5. see here
Check the VMware Hardware Compatability Lists HCL here
The VMware Hardware Compatibility List is the detailed lists showing actual vendor devices that are either physically tested or are similar to the devices tested by VMware or VMware partners. Items on the list are tested with VMware products and are known to operate correctly.Devices which are not on the list may function, but will not be supported by VMware.
http://www.vmware.com/go/hcl
If you have vCenter Server 5.0, this must be upgraded to 5.5 FIRST!