Flashing Atmel AT90USBKEY2 with AT90USB1287 with avrdude

If you should ever need to flash an Atmel AT90USB1287 with avrdude these are the options.

1. Bring the device into dfu mode by simultaneously pressing RST and RWB, letting go of RST first then of RWB
2. then avrdude -pusb1287 -cflip1 -Uflash:w:firmware.hex:a

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