Hey so here is the link to flash the ducky https://github.com/hak5darren/USB-Rubber-Ducky/wiki/Flashing-ducky . If you have any problems you could just reply to this post and I'll help you out. So basically the Twin duck firmware allows you to use the ducky as both a HID and a USB mass storage device. The only limit is that the inject.bin can only be up to 2kb but that isn't much of a problem since you could just put all of the work in an executable on the storage and run it from there.