OK I'm downloading at the moment so, forgive me if this has been asked before but under the link 5'm using it says;
YOU DO NOT NEED TO BE A DEVELOPER TO ACTIVATE USING THE NEW GOLD MASTER VERSIONS OF THE FIRMWARE.
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You need a developer account or get your device added onto another developers device list to get your device to activate using iTunes.
What's this about?
You will see an activation notice on the screen about communicating with development server, but it will load anyway and apparently not lock anything on your phone.