I want to use the Mega 2560 to send MIDI over USB, but it seems like it doesn't have native USB support, so I have to flash the 16U2 with HIDUINO firmware using Atmel Flix
I have have to reset the 16U2 to put it in DFU mode (Device Firmware Update), but I cannot find the 16U2 reset pin on my Mega clone.
This is how it looks like:
It could be some of the 4 pins labeled "X1", but I cannot find any documentation.