Regain root on AT&T Galaxy S4 running I337UCUAMF3 firmware

Finally root has been achieved again on AT&T Galaxy S4 (SGH-I337) running I337UCUAMF3 firmware, thanks to jortex from xda who build a new root exploit for our device. We all know, the most recent OTA update from AT&T and Samsung (Build number: JDQ39.I337UCUAMF3) that we received a few weeks ago contains new security patch, as a result our device are unable to get root access back after installing the update, as the older root method isn’t working anymore.


For those who previously updating their Galaxy S4 firmware to MF3, now you can regain root privileges, although the new method isn’t a one-click solution, but it’s not as difficult as you think. However, an SD card is required to make the rooting process running well.

This method can operate directly on your phone so it does not need the help of any tool, but if you understand the adb (android debug bridge) you can use a PC/Laptop to perform this method. Below is a step by step how to root SGH-I337 running I337UCUAMF3 firmware.

  1. Make sure to backup all the external MicroSD card contents and format it again to exFAT.
  2. Grab a root exploit from jortex’s thread on xda and save the file on the external SD card.
  3. Extract using AndroidZip app or other apps that have the same capability, you will see a new folder “Root_for_ATTSG4_FM3”, open the folder and move all files/folders in it to the root of the external SD card.
  4. Download and install Terminal Emulator app from Play store.
  5. Now open the terminal app then run the following command:
  6. cd /mnt/extSdCard
  7. If the exploit goes well, then you will see a new app installed on the app drawer called SuperSU.
  8. To verify root, now try to install root checker app.
  9. galaxy s4 MF3 root

    Image: Samsung
    Screenshot: rjshenoy @xda

Now root privileges is reclaimed, it is time to freeze some unused bloatware and performing some tweaks. If you don’t want to accidentally accepting an update, you can block future OTA on AT&T Galaxy S4.



Filled Under:Root and Unlock
Related Mods

18 Responses

  1. Shug
    August 6, 2013 at 12:08 AMReply

    This is my first time rooting a device and this method worked PERFECTLY on my Galaxy S4 running MF3!!! THANK YOU Andromods!!!

  2. puv22
    August 6, 2013 at 9:51 AMReply

    Worked like a charm! Does anyone know how to re-enable tethering? Att seems to have added a check even when rooted.

    • DJLAXL
      August 9, 2013 at 8:00 AMReply

      Check this out: _ Created by Scott Rosler, the developer of CleanROM, worked on my Note 2 and now my S4.

  3. Armando
    August 6, 2013 at 2:31 PMReply

    Will I be able to install cyanogenmod 10.1aftrr I root?

    • Author

      August 6, 2013 at 6:33 PMReply

      Nope, there’s no custom recovery yet since the bootloader still locked.

  4. jess
    August 13, 2013 at 9:11 PMReply

    How will we know if a custom recovery becomes available? I’m really looking to flash a custom rom

  5. Trock4u
    August 17, 2013 at 8:41 AMReply

    After the root is done can I reformat my SD card back to the way it was? Sorry if this a stupid? But I new on this.

    • Author

      August 19, 2013 at 12:56 AMReply

      Yes you can.

  6. gwm209
    August 19, 2013 at 5:45 AMReply

    What am I doing wrong? After the first command it says I don’t have permission.

    • Author

      August 19, 2013 at 12:24 PMReply

      1. Have you mount the external SD card? by running this command -> cd /mnt/extSdCard
      2. Are you sure put everything directly on the microSD card and not in a folder on the microSD card
      3. When you get permission failed, just try to continuing running the root command -> ./ then verify it with root checker.

  7. daniel
    August 19, 2013 at 10:50 AMReply

    this did not work i failed to get access after second command some 1 plz help

  8. Tony
    September 2, 2013 at 11:02 AMReply

    Is there sn unroot for this method?

    • Author

      September 2, 2013 at 7:46 PMReply

      You can try Odin or simply use SuperSU, read it here.

  9. EWAI
    September 12, 2013 at 3:57 PMReply

    After I opened ./, I received messages “No such file or directory” for mnt/extSdCard/gs4ex, system/bin/ .ext, system/xbin/su, system/xbin/daemonsu

    Do you know what I need to do?

  10. kevin
    September 23, 2013 at 3:11 PMReply

    how will i know if a custom recovery becomes available for this mf3 build?

  11. jc dorado
    September 24, 2013 at 5:21 PMReply

    follow the instructions exactly the way they are you will have no problems

  12. jc dorado
    September 24, 2013 at 5:22 PMReply

    make sure u have debugging enabled

  13. ahmed
    August 6, 2014 at 7:32 PMReply

    make sure u have debugging enabled

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