Nice!
So, the pins on the 3DS boards I solder a "custom cable" I have that goes directly to a MicroSD to SD adapter (). The "custom cable" goes to the SD Shield, that goes to the Arduino Uno using the Dupont male female cables. The arduino goes to the computer using the an USB cable, right? This way we close the "circuit" between the 3DS and the computer.
Then all I need is to load the Arduino with the code you guys did, assuming we have an Arduino environment already set up, then we run the code and select the erase option.
Is that all, roughly speaking, of course?
Cheers!