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?
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Sekar ChinnakannuStaff EngineerCommented:
Here is the excellent document to perform same and very easy to follow, upgrade it to esxi5
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.
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