I'm trying to create a Midi controller using
https://github.com/tttapa/MIDI_controller with a
Android ADK (board based on Arduino Mega2560 and Circuits@Home USB Host Shield) that I got back in 2011.
I've managed to get it hooked up to my Mac and loaded a sketch onto it in the Arduino IDE so all seems OK from that point of view. However, the next steps are to put it into dfu mode to allow me to switch in and out the midi firmware.
What I cannot work out is how to put it into dfu mode. Looking at the general guide for mega 2560 I would be looking to connect the two pins next to the USB, however this board doesn't have those pins. I'm pretty new to this be from what I can work out I'm trying to connect RESET2 to ground so just need to locate RESET2. Am I right?
On the back of the board there are contact points for GND_1, RST1, MOSI1, SCK1, 5V_1 and MISO1, which I think are the same as "ICSP for ATmega2560" rather than "ICSP for 16U2" (as described here
https://forum.arduino.cc/index.php?topic=125908.0). I can't seem to track anything for RESET2.
Attached are some photos of the board.
Can anyone help me figure out how to get it into dfu mode?

