You Can Update to iOS 7 Without a Registered iPhone UDID

It's currently possible update to iOS 7 beta without having your iPhone's UDID registered in an Apple developer account.

We have tested and confirmed it working on the iPhone 4S, a brand new iPhone 5 and an additional iPhone 5.

To perform the update you must get a hold of the iOS 7 ipsw, press and hold the Option key (Shift for Windows) and click Update in iTunes. Select the iOS 7 ipsw from the popup window to install.

It's unclear why this is working. Only iPhone devices registered by developers are supposed to be able to install beta firmware. Perhaps Apple took down this check since its servers are being flooded at the moment.

Warning:
- Do not do this if you want to retain your jailbreak. You will not be able to get it back.
- Do not do this if you need hacktivation. You will not be able to hacktivate.