How can I unroot a Galaxy S4?

[weston87]

My dad had an Sprint gs3 and I gave him my Sprint gs4. They are both rooted. The my s4 I gave him had cyangenmod 11 on it. He called Sprint to get the numbers switched and he fit them switched but now he can't make any calls or receive calls. So he took it to the Sprint store and they messed with it for a minute Nd told him he would have to unroot it for it to be fixed and the number to fully change. I need to know the best way to get his phone up and going fast?

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[Golfdriver97]

Have you tried unrooting through the superuser app?

 

[weston87]

I didn't know I could.

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