It is very easy to enable new runtime environment (ART) on devices running Android 4.4 kitkat. You must have developer options enabled in your settings. - Go to Settings > Developer Options > Runtime. - Select "Use ART". - It will ask you for a reboot. Reboot device. A system update is performed and you can use ART. - the only problem is many of your existing apps won't work now and need to be reinstalled/ updated.