mobile

So ive had my g3 for about a month now and its been rooted and is on lollipop. The issues i am having is that if i try to full unroot by supersu and update to the latest ota update i get a black screen and flashing red and blue notification LED until i pull the battery. The same happens if i try to install xposed which i really want to do or if i try to install recovery modes or anything and im getting really annoyed with it. Its now unrooted but the update says the phone is rooted which makes no sense to me, maybe super su hasnt unrooted properly? And why am i getting blue and red flashing LEDs everytime i try to do anything interesting on my g3?