Haven't Got the volte latest update for your k4 note yet Dont worry  Download the zip file below from the official lenovo server place the file in sd card (formatted as portable) Boot to recovery (power on by holding vol+ and vol-) select install update  browse to the zip file  install you have the latest volte v230 update ... Note : Make sure you are on the v219 update before manaually updating  Click Here to Download For any doubts  mention in comments and get instant reply