Originally Posted by jlandry287
So yesterday I ran Triangle Away [it worked] then used Odin to install stock firmware (to unroot). When the phone booted SuperUser was still installed with no way to remove.
According to your model number, SPH-L720, you have the Sprint S4?
Before using Triangle Away you have to be on stock rom and recovery. Odin the stock rom (I like to go to custom recovery first and wipe everything). Odin CF-Auto-Root
(if you have the Sprint). It will root you and install a stock recovery. Install Triangle away and run it.
Check back in Triangle Away that your flash counter is now 0. Open the SuperSU app. Tap settings and scroll down and you see an option for 'Full Unroot'. Select that and it will unroot and uninstall SuperSU.
Uninstall Triangle Away. Power off and go to Odin download mode. Check that it says Official for Current Binary and System Status. Power off and reboot. Check in settings > more > about device > status > device status. If it says Official you're done. If not, do a factory reset and it should now say Official and you are out-of-the-box stock.