If your Cleanflight or Betaflight flight controller won't connect to your computer, the most likely cause is that your drivers aren't installed correctly. I'll show you how to install them correctly. I'll also show you the most common ways that people mess them up, how to tell what's gone wrong, and how to fix it. The good news is, if you think you've bricked your flight controller, you probably haven't. It's nearly impossible to brick these devices simply by flashing them incorrectly.
The flight controller in the video is the Lumenier Lux v2. Same great layout and features as the Lux v1, but with the (superior!) 6000 gyro and an on-board SD card reader. This board was provided by GetFPV.