Please help me unroot my phone. I am getting extremely frustrated because it usually would not take this long. I downloaded what I believed was the firmware for my phone and when I tried to flash it it said FAIL! Can someone please provide me with a WORKING link for the Samsung Galaxy S4 SGH-I337 (AT&T)? Also, the package that I downloaded says its 1.6 GB and I only have 1.3 GB on my phone available space.. Could this be why it failed? Thanks.