The Google Developers website has just posted the Factory Images and Binaries of Android 4.4.3 for the Nexus 4, Nexus 5, Nexus 7 and Nexus 10. This means the updates should be coming very soon, but we know some of you just can’t wait.
If you find yourself too desperate to stop yourself from biting right through your nails, you can always install it manually. Do remember this process is not very user-friendly, though. You will need to wipe your device, have ADB/fasboot working, unlock the bootloader and have Android SDK installed. If you are not comfortable with any of these, you should simply wait.
With that disclaimer out of the way, you can go ahead and get the Factory Images and Binaries from their respective websites. We have previously shown you how to install an update from a Factory Image. You need to take the same steps, except using the new Factory Image.
We are not exactly sure what kind of changes we will see, but this is not meant to be a huge update. It will probably address the usual performance and bug fixes, including the dreaded Nexus 5 camera bug. More light will be shed on other improvements or new features as the update rolls out. Stay tuned for more details, and let us know if you start seeing your updates!
[Source: Android Authority]