How do I update/restore my phone to a different version with no internet access on the machine with iTunes installed?

I have downloaded the version of iTunes needed, and the iOS version I wish to use from work, but am unable to restore the version of iOS as iTunes seems to be blocked at work, and I do not have internet at home, aside from on my phone.
Thanks in advance for the help!
~Nathaniel

You can ONLY restore to the latest available software.
If you have ios 5 on your iphone you can update from the iphone itself.
Otherwise you would need to restore from a computer with itunes and the internet.

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