This software is part of the Paparazzi UAV Project. Luftboot is the bootloader for stm32 based autopilots to enable upgrading the autopilot firmware using usb. It implements the dfu standard. Luftboot is based on the usbdfu bootloader implementation by Gareth McMullin for the Black Magic Probe project (http://www.blacksphere.co.nz/main/blackmagic).