There is an apparently new iOS 18 security feature that reboots iPhones that haven’t been unlocked in a few days, frustrating police by making it harder to break into suspects’ iPhones, according to 404 Media.

404 Media, which first reported police warnings about the reboots on Thursday, writes that restarted iPhones enter a more secure “Before First Unlock,” or BFU state. Now, it seems Apple added “inactivity reboot” code in iOS 18.1 that triggers iPhones to restart after they’ve been locked for four days, Chris Wade, who founded mobile analysis company Corellium, told the outlet.

The code appears below in screenshots posted by Dr. -Ing. Jiska Classen, a Hasso Plattner Institute research group leader.

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