If you do not know the PIN/password to unlock the device, the "iLogical" extraction allows you to use a pairing record, obtained from the device owner's PC, to bypass the lock and perform a logical extraction. See What Is A Pairing Record And Where Are They Stored?.
If your device supports physical extraction (see List Of Supported IOS Devices) and uses a simple password (4 digits), MPE+ will also allow you to brute force the password, or just extract the deep logical TAR files. If your device uses an unknown complex password, MPE+ will allow you to extract the deep logical TAR files.