I’m very disappointed to see https://github.com/spark/particle-cli pointing to http://dfu-util.sourceforge.net/ because SF is down right now:
My introduction to Particle.io is a perfect storm of fail. I got a photon in the mail yesterday. (That’s fun to say!) I did get it set up and toggled the D7 LED with tinker. But, today I just have the fast green flashing.
Whatever particle-cli depends on should be forked into spark’s github repo. That’s just sad.