download OTA http://android.clients.google.com/packages/data/ota/google_mako/ebc8bad23772b5fd6e2907e48b4c74ba0ed58f21.signed-occam-JWR66V-from-JDQ39.ebc8bad2.zip
1. First, you need to install the latest Android SDK (or at least steal the newest adb.exe from it). [Android SDK]
*This isn’t a guide on how to get the SDK installed or basic adb. There are dozens of those out there.
2. Plug in your device to your Windows machine. Make sure USB Debugging is enabled.
3. To test that you have adb up and running, and that your device is recognized, open a command prompt.
*The best place to open a command prompt is from within the Platform-Tools in the SDK. Hold SHIFT and the right-click and choose “Open command prompt…”
5. Type the following”
6. You should get a serial number followed by “device.”
7. If you see something along those lines, your adb is working properly, for now.
8. Download the update.zip from Google to your PC that you would like to install on your Nexus.
9. Move the file into your Platform-Tools folder.
10. Type the following:
adb reboot bootloader
11. Your device will now reboot to the bootloader.
12. Use Volume Down on your device to until you see “Recovery.”
13. Select it with the Power button.
14. Your device will boot to an Android logo with a exclamation mark.
15. To jump past this, press Volume Up and Power at the same time.
16. You will now be in stock recovery.
17. With Volume Down, highlight “apply update from ADB.” Press Power to choose it.
18. Back to your PC, type the following command:
adb sideload <filename of update.zip>
19. If your adb is working properly, you should see the file transfer to your device in adb.
*If you get nothing, it’s time to troubleshoot. This trick really helped me.
20. Once that finishes, your device will begin to update.
21. Once it has finished, simply reboot and enjoy the update.