Got this on my iPad, thought "ohh shit, I should back up my phone right now, it's next..." I backed it up and within 20 minutes it had been disabled. Interestingly, it put it in a state in which it was unable to ring for incoming calls. I wish Apple would not report that your iOS version is "up to date" in iTunes if you are running a time-bombed beta build. Even if they don't want to support a direct upgrade path fro…
I too was 'told' I was up-to-date, and lost a ton of parade pictures of the family from this morning. Badly done, Apple. Badly done.
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...