GD: Error 3002 is when iTunes cannot connect to the verification server. You need to check your hosts file and remove the line 74.208.10.249 gs.apple.com You've probably put it there because, like me, you like to upgrade and downgrade and play around with your firmware, and adding that line to the hosts file is what solves some other problems, and maybe you've done that before in your attempts to play with the phone.
Detailed instructions: 1. Open Terminal, then type the following:
sudo nano /etc/hosts2. Find this line in your hosts file and delete it:
74.208.10.249 gs.apple.com3. Alternatively, If you want to preserve the line, you can place a '#' at the start of the line to ignore it, so it looks like this:
#74.208.10.249 gs.apple.com4. Press control+o and hit enter to save. 5. Try your update again.
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