I am having the same issue.
This video showed a different approach:
But, nonetheless it just won't go in DFU mode.
Also i observed, if i remove the shorting of pins and connect the board, "Atmel Flip" recognizes it as Atmega16U2, with the shorting, FLIP doesn't recognize the device.
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Did you have any luck with that so far?
Can anyone please suggest a heading for this..?
Can we use other board like mega or so.?
Is there a way around..
So far, i removed the shorting connector and connected it to my laptop.
I ran atmel FLIP.
selected the device as atmega16u2, opened usb connection and i was able to connect with the device, erase it's flash, verify it's contents
but whenever i selected i select a hex file, it says invalid hex file format.
Any comments on that?