I upgraded to ios 7 beta, and it skipped the activation screen, which enables you to hate ios 7 without an activation or a developer account. However one day the activation screen appeared saying there was an error and i need a developer account. I tried connecting to itunes but it needs a confirmation to trust the computer, and since im still stuck at the screen, i can't trust the computer, making it impossible to restore my device as well.
Iphone 5 stuck at activation screen and can't restore?
You need to register your device's UDID on a site like http://www.instantudid.com/.It's $5, and then you can get past this screen.