IOS 7, Not a registered developer problem. How can I update to release?

My mom's iPhone was updated before iOS 7 Beta 6 was released and now she got the "Not a registered developer" error. Is there a way to upgrade it to the release iOS 7 while retaining everything that she currently has on the iPhone?

First backup to iTunes than, reset the device you won't lose anything

You have to wait 24 hours. I called Verizon and that is what they said.

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