Topic: Windows Firmware Updating Tool
I received my Duo printer with the 1.0 firmware on it, they provided me with this link which includes the latest .bin file and an exe for uploading firmware to the printer, I haven't tried it for different firmware, but would assume that you could upload any firmware that you wanted. I have all these files downloaded in case the remove them from their server, but I would hope they would just provide them to everyone anyways, as it is already out there now...
xyzware dot linzh dot tw/beta/fw/
Enjoy
3DMally