Last week the Galaxy Nexus (Takju), and the Nexus 7 got an OTA to Android 4.2, build JOP40C. Now Google has started rolling out Android 4.2 to the Yakju Galaxy Nexus which is the International Galaxy Nexus that is not from the Play Store. By now you probably know everything that’s in the Android 4.2 update, but if you don’t here’s a quick recap:
Miracast support, Nexus 4 only
Google Now enhancements
New Clock app
Now if you can’t wait for the OTA to come from Google, here’s the factory image direct from Google for your flashing needs. We have instructions on how to flash it below, Thanks to Android Police.
Reboot your Galaxy Nexus, holding the Volume Up and Volume Down buttons while it boots up. Once you see the fastboot menu and “Start,” press Volume Up to navigate to “Recovery” and press the power button. Once you see an Android with a red exclamation point icon, press Volume Up and the Power button together, which will bring you to a new menu. Navigate to “apply update from adb.”
Connect your Galaxy Nexus to your computer with a USB cable.
Make sure you have a recent version of adb that supports the sideload command (if you don’t, download the latest Android SDK to ensure your adb is up-to-date).
Open up a command prompt (cmd in Windows, regular shell in Linux and Mac) in the same directory as the JOP40C zip file you’ve downloaded.
Type in the following:
adb sideload fdf06e8d71c7.signed-yakju-JOP40C-from-JZO54K.fdf06e8d.zip
You should see a progress bar, which will eventually hit 100%. At this point, your device is installing the update.
Reboot and enjoy! You are now running Android 4.2 on your Yakju Galaxy Nexus.
Disclaimer: Droid Forums isn't responsible for any harm to your device - proceed at your own risk.
Source: Galaxy Nexus Forum via Android Police