1. Download the IPSW file of iOS5. This is 620 MB file available for direct download or torrents.
  2. Update the iPhone by going to your iPhone sync screen and clicking on “Update” key by holding the Shift key for Windows and holding the Option key on Mac. This should give a pop-up to browse for the IPSW file. Select it and let it run the process.
  3. If you are lucky, the upgrade will happen and you will get a new activation screen.

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