title: No COM port, no /dev/tty* - tried different OS's, different cables
body: <p>My devkit is an Amica V3, well two of them and both seem to have the same problem.</p>
  
  <p>I tried to get the device to show up to then be able to install the NodeMCU firmware.</p>
  
  <p>I did this on different computers and different OS's (Windows 7/10 + OS X 10.11.4), everytime making sure I installed SiLabs CP210X drivers first.
  No sign of the devkit anywhere... When I unplug it and plug it back in the LED near the WiFi antenna blinks and then nothing. I pressed RST a few times, short/long, nothing.</p>
  
  <p>I really hope you tell me that I'm stupid and that I should have RTFM so I would have not missed providing additional power to the board the first time you flash it... But I doubt that this is the case.</p>