How to root AT&T Galaxy S4 running MK2 software from OTA

A Major update finally coming to AT&T Galaxy S4 (SGH-I337) with build number I337UCUEMK2, so for those of you who wish to feel the Android 4.3 (Jelly Bean) performing on your phone, you should not miss out this update. Don’t be afraid to install this OTA update as it brings new OS update, and the good news is we can still get root on AT&T Galaxy S4 running MK2 software.


The great point is root can be obtained by simply running one-click script and rooting process only lasts for a couple of minutes, so it is ideal for novice users who are not familiar with the Odin flash tool or for those who always failed when struggling with Kingo app.

As we noticed earlier, AT&T has released MJ9 software update for Galaxy S4 which also contains new Android 4.3, but a few days later its has taken out due to some issues that must be addressed before mass roll-out. In return, AT&T issued a new OTA software update with the MK2 version that brings several enhancements and new features like the new Android OS upgrades, Galaxy Gear smart watch compatibility, call reliability, Samsung KNOX, etc.


  1. Make sure the latest Samsung USB Drivers are installed properly on your device, but this is only necessary if you are never connecting your device to the computer before.
  2. Enable USB Debugging, it’s required by the exploit to gain root access on your device.
  3. Download the root exploit script for MK2 software by k1mu from here. Actually, the exploit script was built for the Verizon branded Galaxy S4, but since both devices running the same software version (MK2) then the script worth to try on the AT&T variant.

AT&T Galaxy S4 MK2 root by using one click exploit by k1mu

  1. Link up your smartphone to your computer, make certain your device has been detected.
  2. Unzip the exploit file you’ve downloaded before, you will see two files and a folder.
  3. att galaxy s4 mk2 root one click

  4. Locate an executable “install.bat” file, now double click it to run the script. A CMD window will appear and immediately tried to communicate with your smartphone, if the phone had been recognized, the script will perform the rooting process. If you are stuck on waiting for the device, most likely there is a problem with the installed drivers or you are using a USB 3.0 slot.
  5. When the rooting process is successful, the phone will reboot by itself. Once turned on you will see a new app installed (SuperSU), now your AT&T Galaxy S4 should have root on MK2.



Filled Under:Root and Unlock
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2 Responses

  1. tomacito
    January 13, 2014 at 6:39 AMReply

    This method pretty much worked…
    ATT SGH-1337 MK2

    I have root however I cannot flash custom ROM.
    SU updated itself and no errors were displayed throughout the process.
    when trying to boot into recovery with ClockworkMod, phone boots to ODIN mode with write disabled and no recovery option available to select, only load from cache or ADB etc.
    ClockworkMod installed recovery (which one? I tried both TWRP and touch, they are both installed)

    • Zach
      January 16, 2014 at 6:26 AMReply

      You must install SafeStrap recovery. No traditional custom recovery works because of the locked bootloader.

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