I was able to make it work with the Universal GCode Sender. But when I try to use the Carbide Motion app in Mac, I always get GRBL Error: Cutter not found. The grbl version I have right now is 1.1f. Any thoughts on the issue?
You have to get a (free of charge) license for Carbide Motion first. The Sparkfun Board is not automatically recofniced as a “real” Shapeoko. The steps for requesting the license can be found here: http://docs.carbide3d.com/article/75-sparkfun-stepoko-activation