He waited another five seconds. The iPhone screen stayed pitch black. To an outsider, it looked broken. To Leo, this was the goal.
Leo exhaled. The "black screen" was the sign of success—unlike Recovery Mode, which showed a logo, DFU mode kept the screen dark while the computer took total control of the hardware. How to Open DFU Mode on iPhone 5C
This is different from Recovery Mode, where the screen shows a cable and iTunes logo. DFU Mode is deeper and more effective for fixing corrupted firmware. He waited another five seconds
To force exit DFU Mode on an iPhone 5C, press and hold the Power and Home buttons together for about 10-15 seconds until the Apple logo appears, then release. The device will restart normally. it looked broken. To Leo