title: Can I download code source from board?
body: <p>I've uploaded source code to Arduino Mega board using Sketch. After that, I modified the original code. And later I needed the original code which was not modified for the other board, but I didn't back it up.</p>
  
  <p>Is there any way I can download the source code from the board that I uploaded before?
  Or is it possible to dump the original code from the board to another?</p>
  
  <p>I heard there can be a way using ISP but I'm not sure.</p>