How to Uninstall Android L and Restore KitKat on Nexus 5
After a few weeks of running Android L Developer Preview, you might want to uninstall it from your Nexus 5 and restore the KitKat. As the stable version of Android L will not be with us until this autumn and the developer preview was never intended to be used as a daily device, it is better to uninstall it from your device.
