Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
It has been suggested that this article be merged into Firmware. (Discuss) Proposed since August 2014.
It has been suggested that this article be merged into USB. (Discuss) Proposed since August 2014.
Device Firmware Upgrade (DFU) is a mechanism for upgrading the firmware of USB devices with improved versions as they become available from manufacturers. Any class of USB device can exploit this capability.