Apple is changing settings in iOS that will help prevent devices used by law enforcement and hackers from unlocking iPhone models. New products from companies like Cellebrite and GrayShift use a USB connection through Apple's proprietary Lightning port in order to bypass limits on passcode attempts that Apple built into the operating system. These limits were designed to prevent law enforcement and hackers from cracking open a locked iPhone by continually guessing passcodes until they stumble on the right one.
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Owners had a similar problem with the iPhone 5 in 2012.