The page linked above talks about modifying the driver inf file to include the identifier of your specific Nexus device. The problem with this, is that it appears the USB driver is no longer update by Google for specific Android devices (even if you grab the latest using the SDK manager) nor does it actually need to be if you follow these instructions. Actually, updating the inf file means that Windows will be able to automatically detect and install drivers for your device, but it can be difficult for the average user to find the device identifier and do this. Instead it is easier to do the process manually:
- Follow the instructions above until you get your device to the point where you have selected sideload using adb from the recovery screen and your device is displaying Now send the package you want to apply to the device with "adb sideload
- At this point you may see Windows pop up a dialog with the text Installing drivers for your device but it will fail and be unable to find the drivers. Usually at this point, you will be unable see the device in your device manager and manually install the drivers
- Unplug your device and plug it back in. Again you should Windows attempt to install drivers for your device. This time when it fails, go to the device manager and you will see Android device with an exclamation mark. You can now manually install a driver for the device by using the Google USB drivers you downloaded. You will be presented with 3 options - select ADB composite device and the drivers will be installed
- You can now sideload the device using the command adb sideload
as described above
If you need to find the USB driver manually because you do not have the SDK manager, you can find more details here.