Apple randomly signing iOS 6.0.x firmware, allowing users to downgrade and re-jailbreak [Update: Signing Window closed]
We’ve some great news if you had accidentally upgraded your iOS device to iOS 6.1.3 or iOS 6.1.4 making it impossible to jailbreak your device due to the lack of a jailbreak.
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http://feeds.iphonehacks.com/~r/iphonehacks/~3/WVhrMNf3JUQ/apple-randomly-signing-ios-6-0-x-firmware.html