Android SDK download the Eclipse ADT bundle on Windows 7 PC. NEW LINK developer.android.com/sdk/index.html. With Android developer tools you can connect your android device over/via USB and use the ADB tool (android debug bridge) in the platform-tools folder to debug on your device and send commands to your android devices and flash nexus factory images you must enable USB debugging in your android device system settings.NEW LINK developer.android.com/sdk/index.html How To Enable Developer Options Android Nexus 5, 7-youtu.be/p_hVelfLtdE How To Fastboot OEM Unlock & Lock Bootloader Android Nexus 7- youtu.be/5ZVW-XzPCXE. How To Install Google USB Driver Android ADB Debugging Windows PC-youtu.be/jqReJ80mrFI