Elcomsoft shared a short promo video about their forensic software ‘Elcomsoft Mobile Forensic Bundle: Digital Forensic Tools For Government and Law Enforcemen’. It is good work!
DFU Mode or Device Firmware Upgrade mode allows all devices to be restored from any state. It is essentially a mode where the BootROM. DFU is burned into the hardware, so it cannot be removed.
Just a few days ago we updated iOS Forensic Toolkit with iOS 10 support. At that time, no jailbreak was available for iOS 10.2. As a consequence, physical acquisition was impossible.