Apple’s latest  iOS update could make it a lot harder for law enforcement to access files on a suspect’s phone, a security researcher has claimed.

The new security feature was spotted in an early beta preview of iOS 11.4, which is expected to be released in the next few weeks. It works by disabling the Lightning port, which is used for both charging and to sync an iPhone to a Mac or PC, if the phone has not been unlocked for seven days.

If it arrives, the feature may be a welcome deterrent for thieves, but will deal a blow to forensics experts as it may spell the end of iPhone “cracking”, a method used by law enforcement to break into phones, according to cyber security  experts Elcomsoft.