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Re:iOS 7 “activation required” error on iPhone and iPad by taspeotis on Saturday October 05, 2013 @11:06PM (#6502936)
You didn't have to lose those photos. You can "update" to a particular IPSW in iTunes [1].

So just download a "production" iOS 7 IPSW and "update" to it.

That's what I did to update when the iOS 7 GM came out, and I've used it in the past when I unintentionally let an iOS 6 beta expire.

[1] http://www.jailbreaksquad.com/wp-content/uploads/2013/01/Bro...

Re:iOS 7 “activation required” error on iPhone and iPad by hcal on Saturday October 05, 2013 @11:34PM (#6503003)
Apple was also nice enough to allow the device to sync in the background while the requires authorization screen is up.