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How To Root Galaxy S4 SGH-I337 [AT&T] on Android 4.4.4 KitKat [Best Firmare]

How To Root Galaxy S4 SGH-I337 [AT&T] on Android 4.4.4 KitKat Firmware: Samsung is the most popular Smartphones/Tablets manufacturing company providing the powerful flagships and also the best customer support to the world. Here at AndroidBlog we always provide the latest news, rooting guides and apps to the Android users. Every Android user wishes to have root access to get much of an Android device. So if you have AT&T Galaxy S4 SGH-I337 Smartphone and want to root it then here is good news for you that Samsung released a minor update I337UCUFNJ4 firmware upgrade for Samsung Galaxy S4 (AT&T) to brings the Android 4.4.4 KitKat. This update includes minor enhancements, Knox 2.0, security updates and some new preloaded applications.

Thanks to the XDA Developer muniz_ri for providing the root procedure on the new firmware. So if you are ready for the KitKat 4.4.4 update on Samsung Galaxy S4 (AT&T) then here is a step by step guide that how to root Galaxy S4 on the I337UCUFNJ4 firmware.

Root Galaxy S4 SGH-I337 AT&T on Android 4.4.4 KitKat Firmware


AndroidBlog will not responsible if anything goes wrong during or after the rooting process. As wrong firmware may brick your device. Please proceed at your risk.


  • Check twice your device’s model; this tutorial is only applicable for the Samsung Galaxy S4 AT&T, Model number SGH-I337. Do not try it on the other model.
  • Take a proper backup of your Galaxy S4 such as SMS, MMS, Contacts and Media Storage, etc.
  • Enable USB Debugging by navigating to Settings > Developer Options > USB Debugging
  • Download & Install Samsung Galaxy S4 Drivers
  • Make sure that your device’s battery is charged at least about 80% to avoid shutdowns.

Downloads Files:

  1. Download SuperSU
  2. Download Odin v3.10.0
  3. Download Towel Root APK
  4. Download I337_NC1_Stock_Kernel
  5. Download I337_NJ4_Stock_Kernel

Steps To Root Galaxy S4 SGH-I337 AT&T on I337UCUFNJ4 Firmware

1: – First of all, get the I337UCUFNJ4 Firmware update on your Samsung Galaxy S4 manually or via OTA.

2: – Extract the Odin Flashing Tool on the desktop of your PC that you have already downloaded from the above link.

3: – Now run Odin Tool as an Administrator on your PC.

4: – Put your AT&T Galaxy 4 into the Download Mode, to do this Turn Off your Galaxy S4 first and then press and hold Home + Power + Volume Down keys altogether.

5: – While your Galaxy S4 is in Download Mode, plug it to the PC through USB cable. Once your device properly connected to the PC, the ID: COM section will turn yellow or blue.

6: – Now click on “AP” / “PDA” tab in the Odin and locate the firmware I337_NC1_Stock_Kernel file.

7: – Click on “Start” button to initiate the flashing process to update your device. Your device will be rebooted, once the firmware is updated.

8: – Your device is now updated with the I337_NC1_Stock_Kernel firmware. Next, star the rooting process of your Galaxy S4.

9: – Copy the TowelRoot App into the internal/external memory of your device. Now reboot the device and run Towelroot app on it.

10: – Launch the towel root app on your Samsung Galaxy S4 and press the button Make it Rain” to root your device.

11: – It will root your phone now its the time to flash the I337_NJ4_Stock_Kernel via Odin flashing tool to get back to the stock NJ4 kernel.

12: – Finally, again reboot the Galaxy S4 and download the SuperSU app from the above link, SuperSu App enables you to manage root permissions on your device.

Note: Extreme lag may appear on your device making it unable to install Towel root after flashing the NJ4 firmware. Just give a reboot to your Galaxy S4 AT&T once and try again. Now everything will be set.

Done! These were complete steps to root Galaxy S4 SGH-I337 on Android 4.4.4 KitKat (I337UCUFNJ4) firmware. Let us know in the comments area below if there is any question or query and we’ll try our best to help ASAP.

Aamir Jamal

An Android Geek and audiophile who love to read and write reviews/tutorials about gadgets and new tech stuff. He has written 1007 guides and other posts.

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  1. trying to flash the first file odin reported fail and went into emergency firmware recovery screen i do not recommend using this method, wait until more methods are available

  2. OMG! You guys @ XDA rock… My 1st attempt at rooting a phone (galaxy s4 i337) was too easy. I was nervous after reading a lot of the comments but decided to try it. I know everything does not always go as planned but if you follow XDA’s instructions carefully. You will have a rooted a phone in minutes. Thanka so much to xda devs!

  3. Could you show me how to get the I337UCUFNJ4 Firmware update on your Samsung Galaxy S4 manually or via OTA? (aka. step No.1) Pls!

  4. Ok what work for me finally was using this version of Odin the installing the I337_NC1_Stock_Kernel then Towelroot Got Root Message installed superUser and check with
    Root Checker which verified root…. But then i was not able to connect to wifi anymorey had no mobile network carrier message either..Long story short i installed I337_NJ4_Stock_Kernel on the phone same steps like the first installation but this time you install the NJ4 firmware my phone booted i still had Root and i could connect to wifi…. I dont know if this will be of any help to anyone but thats what finally work on my phone

  5. Took my time read and reread directions and it worked perfect. Only thing I had trouble was getting phone back into download mode to flash NJ4 kernel other then that everything went smooth

    1. Just google towel root apk, download it from your phone. Make sure you go under settings/ security and check box for unknown sources first..

  6. Doesn’t work. I get stuck with this.

    Enter CS for MD5..
    Check MD5.. Do not unplug the cable..
    Please wait..
    I337_NC1_Stock_Kernel.tar.md5 is valid.
    Checking MD5 finished Sucessfully..
    Leave CS..
    Odin v.3 engine (ID:4)..
    File analysis..
    Get PIT for mapping..
    Firmware update start..

    it never goes past this process. it just.. sits there.. and sits there.. and sits there.

    1. Turn USB debugging on and put your phone in download mode ( vol down + power + home keys )
      Try again..

  7. i got up to rebooting my phone then tried to “make it ra1n” and it said this phone isnt currently supported. please help

  8. Worked fine. Had to navigate to the towelroot website and download/install from there because my device was no longer discoverable on my laptop after step 7.

  9. What are the differences between following these steps on a Mac v. a PC?
    I didn’t bother downloading the USB drivers since it’s an .exe file, so I need to find those elsewhere.
    But after that, are the steps virtually the same?
    I really want to drop all the Samsung bloatware and try out the google play edition ROM.
    Please help a Mac using noob out. Thanks.

    1. Yes the instructions are the same for mac, no difference.. make sure yoy get those drivers though, otherwise your pc will not recognize your phone.
      For drivers try downloading samsung kies they will come with it. OR
      Try sammobile website. GL..

  10. If you have a GSM phone (typically AT&T as well as T-Mobile), as well as it is unlocked
    (you are not in an agreement), you could go ahead and also
    use a local SIM.

  11. Used odin to flash nj1, after that my laptop would no longer see my phone, and my phone wouldnt connect to wifi. finished root using data on my phone, the root worked fine. I just never flashed back to nj4, cant turn my wifi on and my laptop still wont see my phone. whatd i do wrong? what can i do to fix this?

  12. Before I attempt this, I’d like to ask: will this factory reset my phone (I.e. do I have to flash from odin with the factory reset option checked)?

  13. nj4 link not working. cant tell if this works or not… ill check back in a few days hopefully link works then.

  14. link works today, but why when i upload the nc1 stock kernal do i loose wifi? makes it kinda hard for towelroot to do anything cause it says no network connection…….. I rebooted into dwnld mode and used odin 10 to reload nj4 kernal and wifi is back….. I tried again and still looses wifi when i load nc1 kernal…. any help appreciated………

  15. My samsung At&t met the whole prerequisites, it was runnig 4.2.2 and the tethering feature was blocked off, i tried this whole step and i didnt miss any, until step 6 Now click on “AP” / “PDA” tab in the Odin and locate the firmware I337_NC1_Stock_Kernel file and the phone tried to reboot and failed, it has been writing “System software not authorized by AT&T has been found on your phone.Please turn off your phone and go to the nearest AT&T store for help”

  16. hi
    after flash NC1 .wifi not work and Towelroot need wifi.
    so i use “IRoot” and woked
    Then back to NJ4 Kernel and everything is ok

  17. after using odin and installing he firmware I337_NC1_Stock_Kernel file the phone rebooted and the wifi is turned off and wont come back on, so when I try to use towelroot and makeitrain it just says “Please ensure you are connected to the internet”. What can I do since my phone wont allow me to put it into wifi now?

    1. You need to flash the NJ4 kernel now.
      Follow the instructions carefully to the end. It will all be right when finished..

  18. Hi, Followed your steps above and ended up losing my wifi. Also my phone doesn’t show up on my PC any longer. I’m unable to turn on my wifi. I have kitkat 4.4.4 my baseband ver is I337UCUFNJ5…….I’m afraid I hosed my phone. Suggestions….help! Thanks

  19. I rooted with the above directions and it completely worked. Stupidly, I let a OTA update through and it broke my root. I tried rooting again with these same steps and it no longer works. Any ideas? I’m still on kitkat 4.4.4 Kernel 3.4.0-2960651

  20. Worked flawlessly on one of my S4s. The other got stuck in Recovery Boot cycle. A couple other articles suggested the Data Wipe/Factory Reset then clearing the Cash Partition was the only option if this happened. DO NOT do that. Clearly it wipes out your pics, etc… but it DID NOT work. What did work was going back to the Odin folder and launching the oldest version rather than the newest. Presto! Done in a snap just like the first one.

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