The screen lock passcode is absolutely required to generate the encryption key, which in turn is absolutely required to decrypt the iPhone’s file system. In Apple’s world, the content of the iPhone remains securely encrypted until the moment the user taps in their screen lock passcode. BFU devices are those that have been powered off or rebooted and have never been subsequently unlocked, not even once, by entering the correct screen lock passcode. The BFU stands for “Before First Unlock”. We have a few other changes and some tips on extracting locked and disabled devices. In today’s update (for both Windows and macOS platforms as usual), we’ve added the ability to extract select keychain records in the BFU (Before First Unlock) mode. The supported devices include models ranging from the iPhone 5s through the iPhone X regardless of the iOS version more on that in iOS Device Acquisition with checkra1n Jailbreak. We have recently updated Elcomsoft iOS Forensic Toolkit, adding the ability to acquire the file system from a wide range of iOS devices.
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