CANCEL DOWNLOAD OF NOUGAT VERSION

If you want to cancel the update, disable your internet connection first then go to Settings>Apps. On the upper right corner click the three dots then click Show System. Scroll down and look for FOTAService. Click it then click Storage then click Clear Data. Your download update progress has now been cleared. Before enabling your internet connection again, go first to Settings>About>System Update. On Auto download system update select don't auto download system update. In this way, your phone won't auto download updates whenever it is availble when you enable your internet connection.