Complete Fix Solution

This tutorial uses the Root Exploit package released by Senior XDA-Developers, k1mu. The Root Exploit package allows Galaxy S4 users to root their devices easily without tripping the KNOX warranty void counter.

Disclaimer: We and the developer of this rooting procedures shall not be held responsible if any undesirable outcomes may happen to your device. use of this root guide is solely at your own risk!

1. Install USB Drivers for Samsung Galaxy S4 on the computer.

2. Enable USB Debugging Mode on the phone. Go to Settings >> About Phone. Tap on Build Number several times till the message shows "You are now a Developer". Then enable USB debugging by navigating to Settings >> Developer Options.

3. Make a backup of all your important data before following the guide.

4. Ensure the battery of the phone is charged more than 80 percent.

5. The Root Exploit package works only on the T-Mobile version of the Galaxy S4 (SGH-M919). Applying this to any incorrect variant might brick the device. Verify the model number of the Galaxy S4 by navigating to Settings >> About Phone.

1. Root Exploit (saferoot.zip) - Mirror Link

If you are using Linux or Mac OS X, navigate to the extracted directory in a terminal and run the following command. Please note that youll need to have the Android Debugging Bridge (adb) installed and configured on your path.

Thats it! Samsung Galaxy S4 (T-Mobile) SGH-M919 running on Android 4.3 Jelly Bean is now rooted successfully. You can now install any app that requires root permission. Verify the root status of the device by downloading Root Checker app from Google Play Store.

Note: This exploit will NOT set the KNOX warranty void flag. It will set the "Custom" flag, but thats nothing to worry about.

Thanks to all fellas at XDA who first tried out this rooting technique. This method was originally posted via XDA-Developers original thread.