The term DFU actually stands for Device Firmware Upgrade. The DFU mode is a state which affords you the opportunity to put your iPhone in interface with iTunes while preventing the iOS operating system from loading. The DFU mode is used for many things such as firmware upgrade, rebooting, tethered, jailbreaking device and firmware downgrade. In this generation of jailbreaking, the DFU mode is an inevitable thing. [Read more…]