uploading sketches from ethernet for Duo

I have located information for changing the bootloader to upload a new sketch via the ethernet for the UNO (ATmega328 microcontroller) in the fine article by Philip Lindsay [ i.e. http://www.freetronics.com/pages/how-to-upload-a-sketch-to-your-arduino-via-a-network#.Uw5B1WJdUa8 ]. What I need to do is the same thing for the DUO [SAM3x processor]. Any one have ideas?

:stuck_out_tongue_closed_eyes: I posted the same question two weeks ago. http://forum.arduino.cc/index.php?topic=217432.0 So far, I haven't figured it out. Would anyone kindly provide any ideas?

Just find some information, maybe it will help. http://electronics.stackexchange.com/questions/65590/usb-bootloader-for-the-arduino-due