I am confused, I do not know where the arduino firmware resides. There is a Rasberry Pi board and a Ramps board in the Robo R2. I have firmware in the SD card plugged into the Rasberry Pi board. Is the ramps board a completely dumb board? Can I purchase a ramps boards on eBay, wire it up to the correct wires in the Robo R2 and be off and running with no firmware to modify?