Thankfully, you don't have to delve too far into itselect everything in the top Tools section, then click the Install button. You can now turn your attention to the system image you've downloaded for the Nexus 5 or Nexus 7 The .tgz archive file you've saved to disk holds another archive file in the .tar format. Use a tool such as 7-Zip to extract the individual files in this second archive to the platform-tools folder contained within the location where you've placed the SDK kit. These files include the device image itself and the routines required to install it. Open this http://7-zipdownload.us platform-tools folder in File Explorer, hold down Shift and right-click inside it. Choose Open command window here from the menu to bring up the command prompt. Type adb devices and hit Enter to see if your Nexus device is available if nothing is shown under the list of attached devices, you've gone wrong somewhere. Retrace your steps to troubleshoot the problem, checking drivers, USB debugging and USB mode. If your device is shown, switch it off then hold down the power and volume down buttons to get it into bootloader mode (which will show a list of device specs and an open Android robot on the screen).
Original article here: http://fieldguide.gizmodo.com/how-to-install-android-l-preview-right-now-1599055870/+barrett