I bricked mine into this state once somehow. What worked for me (on Debian):
1.) Download firmware from git (I used 0.6.0)
2.) Loaded it into the Arduino IDE, did a compile to make sure everything worked.
3.) Had it plugged in, had the right settings enabled.
4.) Hit the reset button and immediately hit compile/upload.
Seems to work, but you have at most a few seconds to get that upload going.