DFU stands for Device Firmware Upgrade and dfu-util is the host side implementation of the DFU specification from the USB forum.
DFU is intended to download and upload firmware to devices connected over USB. It ranges from small devices like micro-controller boards up to mobile phones.
With dfu-util you are able to download firmware to your device or upload firmware from it. Most test where done with the Openmoko Neo1973 and Freerunner so far but other devices have been reported working and on more is being worked
These details are provided for information only. No information here is legal advice and should not be used as such.