iOS 11.4 adds USB Restricted Mode, port becomes power-only after 7 days without login

ElcomSoft blog:

In the iOS 11.4 Beta, Apple introduced a new called USB Restricted Mode. In fact, the feature made its first appearance in the iOS 11.3 Beta, but was later removed from the final release. This is how it works:

“To improve security, for a locked iOS device to communicate with USB accessories you must connect an accessory via lightning connector to the device while unlocked – or enter your device passcode while connected – at least once a week.”

And:

In other words, law enforcement will have at most 7 days from the time the device was last unlocked to perform the extraction using any known forensic techniques, be it logical acquisition or passcode recovery via GreyKey or other services.

It will be interesting to see if this mode survives through to the actual public release of 11.4. A chess move. Will the GreyKey folks have a follow-up? Or will all those $30K GreyKey devices become useless against updated phones?