You can no longer downgrade from iOS 7 to iOS 6.1.3 or iOS 6.1.4
If you updated your iPhone, iPad or iPod touch to iOS 7, and didn’t like it or finding it laggy on your device and want to downgrade back to iOS 6, then we have some bad news, the window to downgrade from iOS 7 to iOS 6 is now closed.
That is because Apple has stopped signing iOS 6.1.4 (for iPhone 5) and iOS 6.1.3 (for all the compatible devices).
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