I know this topic is about how to root the s4, but I have this question on my mind... is possible to turn back and unroot the s4 and not lose the factory warranty?
Yes. It is possible.
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How?
I'll PM you
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For some reason this is not working on T- Mobile version for me. Any thoughts? SU is installing but there is no root.
I rooted my updated T-mobile version with this yesterday. [SGH-M919] CF-Auto-Root - xda-developers
I didn't have success using other methods.