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- Plug in your iOS Device.
- Open iTunes
- Click on your iDevice in the left side bar
- In the middle portion, click on ‘Serial Number’ until it changes to ‘identifier (UDID)’
- Go to the Edit menu and then click Copy.
- At this point you will need to pick a device and pay for the activation on the site.
- IMPORTANT>> At this point it is strongly recommended that you perform a full backup
- Update your iPhone using iTunes. To do this, connect your iPhone to your computer, click on the Restore button with the Option (Mac) or Shift (PC) key pressed. Select the iOS 5 IPSW file from the location you downloaded it to.
- Wait until it upgrades. A new activation screen will appear.
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