I wish to restore my iPhone4

When I try to restore my Iphone 4 (5.0.1), iTunes puts the downloadung of OS 5.01 in the way.
I could go through that again but it takes 15 hours on my connection and usually ends up with a connection time out just before completion.
Why would iTunes offer this when already downloaded since first coming out.
Please is there a way round this-I tried cancelling the download process but this just stops the restore.
Thanks

Thanks for reply
I followed link and tried to download the update. It was to take 15 hours, that is overnight. This morning there is an icon on my desktop resembling a cube showing a musical note on one side. It will not open.
Checking for software update on my iPhone results in response 'your software is up to date'.
I wondered why Apple have not released this update via iTunes.
Will I be forever unable to reset my iPhone?
Thanks for your help.
John

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