Android announced a big update to Android KitKat as the new Android L. What was great for enthusiasts and developers is that Google announced that anyone would be able to download the system images to make apps or just try the new OS out.
To start off, these images are only available for the Nexus 5 and the Nexus 7 WiFi model. There are over 5000 new APIs incorporated into the new Android log so it’s definitely worth a shot. If you have either of the nexus devices then you should head over here and download the image, necessary drivers and the SDK itself.
The above procedure is detailed on the page and we do not recommend you do this if ou are not confident. We cannot be held accountable to any damage caused. PS : it’s worth the effort, you should try it out.