Device Firmware Upgrade (DFU) mode

A mode in which a device’s Boot ROM code waits to be recovered over USB. The screen is black when in DFU mode, but upon connecting to a computer with the Finder or iTunes, the following prompt is presented: “Finder (or the iTunes) has detected an [iPad][iPhone] in Recovery mode. The user needs to restore this [iPad][iPhone] before it can be used with Finder (or the iTunes).”