We got an Arduino UNO R3 with an atmega16u2 and we can't put it in DFU Mode, we tried using the RESET and the GND but nothing happened. Then we tried using the 5 and 6 pin of the SPI, and it nothing happened again. Any help would be appreciated, we really need this!
I give you some pics of the arduino, so you can see it...
Thanks for your time.
PD: Forgive me if I made a mistake on my writing. Hope you can understand my point