iOS 11.4.1 (and iOS 12) include new line of defence against a type of security hack aimed at brute-forcing access to iPhones and iPads. The Grayshift boxes plug into the Lightning port and remove prolonged delays between PIN code attempts, allowing law enforcement (or criminals) to brute-force an unlock.
The new USB Restricted Mode in iOS 11.4.1 simply prevents any USB accessories from connecting if the phone has not been unlocked in the last hour. As it typically takes more than a hour to get a warrant for police to be allowed to use a Grayshift box, this is quite a significant roadblock. However, ElcomSoft note that the behaviour can be worked around in some cases …
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