I followed and used this thread ( http://forum.xda-developers.com/show....php?t=1963790
) to root my phone, and i have no troubles following the steps. I searched around the thread and found out that i can unroot my phone with the SuperSU app, so i went into the app and selected the unroot button. To my knowledge it worked, since when i went into my Root Check app it said that there wasn't any root found. But here is my problem, when i go into my phone settings and select the stock update for my phone it gives me a message of "Your device has been modified. Software updates are not available", so am I missing something? Is there another step i must do to be able to update my phone from 4.1.2. My phone is the Galaxy S3 SGH-I747M. Thanks for taking the time to read my post!