AT90USB82 USB Bootloader v1.0.5 atmel avr usb bootloader firmware. use in case that you accidentally deleted the bootloader that is shipped with the mcu.

LUFA (Lightweight USB fr a mework for AVRs) is my first foray into the world of USB. Originally based on the AT90USBKEY from Atmel, it is an open-source, driver for the USB-enabled AT90USBXXX AVR microcontroller series,