How to upgrade esxi4 to esxi5 via update manager

I want to upgrade esxi from esxi4 to esxi5 .
I download esxi5 iso from vmware site, and uploaded to update manager.

but, I am not sure how to use update manager to upgrade to esxi5.
what should I do?
shouichiAsked:
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Sekar ChinnakannuStaff EngineerCommented:
Here is the excellent document to perform same and very easy to follow, upgrade it to esxi5 http://www.sysadmintutorials.com/tutorials/vmware-vsphere-5-x/vcenter-5-x/update-manager/esxi-4-upgrade-to-esxi-5-using-update-manager/
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RickEpnetCommented:
Keep in mind if you upgrade you even if you upgrade you current VMFS 3 to VMFS 5 you cannot take advantage of all the new features of VMFS5.  

http://www.boche.net/blog/index.php/2011/07/21/vmfs-5-vmfs-3-whats-the-deal/
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