The AT&T variant of the Samsung Galaxy S4 is model SGH-I337 and brings in the same hardware configuration of the S4 and moreover, AT&T didn’t take much of time to bring the tasty Android 4.4.2 KitKat update to the Galaxy S4 SHG-I337. It is here now in our hands, ready to be pushed to your device. The released build is labeled I337UCUFNB1 and consists of new features like Galaxy Gear compatibility, Dialer app, Camera, Gallery app update, drag-and-drop function and several other upgrades & bug fixes. The procedure is quite simple and familiar to any Samsung user, using the Odin flashing tool to Install Android 4.4.2 KitKat on AT&T Galaxy S4 SGH-I337.


Installing or updating firmware using Odin program may harm your device and even break your warranty period. Be sure of what you’re doing, everything at your own risk. DroidViews or any of its community members shall not be held responsible for any damage to your device.


» Install Samsung device drivers and reboot your PC: Click here

» Enable USB Debugging if you haven’t enabled it till now, detailed steps on how to do it could be found here.

» Charge your S4 at least to 60% of battery to avoid any mishaps during the process.

» Backup everything, this includes your internal storage, music, photos, SMS, contacts etc.

» Download Odin flashing tool and extract it to a suitable location: Click here

» Download the firmware package and extract its content: Click here

Steps to Install Android 4.4.2 KitKat on AT&T Galaxy S4

  1. Open the Odin flashing tool by double-click the Odin3 v3.09.exe.
  2. Make sure that F.Reset Time and Auto Reboot are selected and everything else is unchecked.
  3. Power off your S4 now. Press the Volume Down + Home + Power keys altogether until you see a warning screen. Press the Volume up key now to boot the device into Download Mode.
  4. Connect the device to the PC now, using the USB data cable.
  5. On the top left of the Odin window, the ID:COM port will be show, which means the device connection has been successfully established. If not, try re-installing the drivers properly.
  6. Click on the PDA/AP button, browse to wherever the firmware package was extracted and select ALL_ATT_I337UCUFNB1_I337ATTFNB1_505595_REV06_user_low_ship_MULTI_CERT.tar.md5
  7. Click on the Start button to activate the flashing process which will merely take a few minutes. Until then hold back and do not disturb the setup in any way.
  8. On completion, a PASS!! message will be displayed, post which the device will reboot automatically and reboot into the new and updated firmware on your AT&T Galaxy S4 SGH-I337.

How does it feel to be operating on the latest Android version? Incredible, I am sure. Tell us your views about this update using the comments. Your support is highly appreciated.


  1. I have an At&t Galaxy S4, its Android Version is 4.2.2 and baseband version is I337UCUAMF3, If I do this steps will it change to I337UCUFNB1 and will become Kitkat 4.4.2 ? reply asap admin

  2. great job….i was successfully able to upgrade my phone software to kitkat….many thanks…..

  3. I have Samsung Galaxy S4 SGH-i337 with a baseband i337UCUAMF3,Build Number JDQ39.i337UCUAMF3. how to connect with pc its giving error like usb not recognize plz suggest me that what i do i’m so fed up with that 🙁 .

  4. It’s worked perfectly. Now need to root it. How to root the installed software 4.4.2 in my Samsung Galaxy S4 I337?

  5. Hello. I have Samsung Galaxy S4 SGH-i337 with a baseband i337UCUAMDL,Build Number JDQ39.i337UCUAMDL. Can I flash this kiktat Rom on my device?

  6. Thanks for the reply rakesh. Could you send me a screen shot as to what the cm 12l looks like on the s3 neo. Thanks

  7. Thank you very much from Ecuador !! , I was looking for a stable 4.4 version months ago and this one works great. People like you make tech things happens in a better way , i was an older iphone user , now I confirm that Google make everything more standard and possible

  8. After I flashed everything worked inducing wifi, but when I put my SIM in, it dosent get service.

  9. Added!!

    Enter CS for MD5..

    Check MD5.. Do not unplug the cable..

    Please wait..

    ALL_ATT_I337UCUFNB1_I337ATTFNB1_505595_REV06_user_low_ship_MULTI_CERT.tar.md5 is valid.

    Checking MD5 finished Sucessfully..

    Leave CS..

    Odin v.3 engine (ID:6)..

    File analysis..


    Can’t open the serial(COM) port.

    All threads completed. (succeed 0 / failed 1)

    what can be the reason ?

  10. Sorry to bother you again once more but with the Lolipop update, is there a way to get your notifications to show up on your lock screen?

  11. Yes, the undowngradable bootloader is the culprit. The tutorial you are referring to is about the Verizon S5 and it’s quite irrelevant for you at least.

  12. Oh, I see.
    It’s frustrating that I can’t downgrade but I’ll live with it, I suppose.
    Rakesh before I go, I’m just curious(This is just for my reassurance that I can’t downgrade).. I was trying to follow a bunch of different tutorials earlier trying to downgrade..
    I was basically trying to follow this tutorial:
    But because of Lolipop’s bootloader is it impossible? I
    ‘m sorry I’m dragging this conversation out for so long.

  13. Hi, I’m not sure if you guys are still checking this site but I keep on getting an error message. B(
    I downloaded the firmware and Odin. But I’m following the steps but it says “FAIL” instead of “PASS”. I’m pretty sure I have the right firmware, so I’m not sure what…is up.

  14. moi install root 5.0.1 lollipop comment fait pour installer version d origin 4.4.2 par c que le wifi ne march pas 5.0.1??????
    pleas aideee moi

  15. thanks but can u post a link for the same… i have SGH-I337 and 4.4.2 installed so please if you can provide me a link for a new firmware which i should try it would be helpful… thanks again

  16. i just updated with the above mentioned steps everything went fine except that when the phone started i cant locate the mobile data icon in the notification panel and nor does it automatically detect my carrier… what to do please help

  17. I think that was the first problem, I my model is the SGH-i337M
    So I googled the firmware for that and found one, extracted it, loaded it up and did pretty much the exact same steps.
    This time the “loading bar” did begin to work for some seconds but quickly went into a “FAIL!” again. This is the new log:

    Enter CS for MD5..
    Check MD5.. Do not unplug the cable..
    Please wait..
    I337MVLUFNC1_I337MOYAFNC1_I337MVLUFNC1_HOME.tar.md5 is valid.
    Checking MD5 finished Sucessfully..
    Leave CS..
    Odin v.3 engine (ID:6)..
    File analysis..
    Get PIT for mapping..
    Firmware update start..
    NAND Write Start!!
    Complete(Write) operation failed.
    All threads completed. (succeed 0 / failed 1)

    Any other reason this might be happening? Once again, I’ve tried it several times.

    Thanks for the effort, really appreciate it

  18. Make sure you’re not using any .pit files, and you model number matches the one stated above. If all is okay and it still doesn’t work try restarting the PC or try changing the USB port.

  19. Hey, I’m following step by step but in step “8.”, instead of a “PASS!!” I am getting “FAIL!”.

    Here is the log:

    Enter CS for MD5..
    Check MD5.. Do not unplug the cable..
    Please wait..
    ALL_ATT_I337UCUFNB1_I337ATTFNB1_505595_REV06_user_low_ship_MULTI_CERT.tar.md5 is valid.
    Checking MD5 finished Sucessfully..
    Leave CS..
    Odin v.3 engine (ID:4)..
    File analysis..
    Complete(Write) operation failed.
    All threads completed. (succeed 0 / failed 1)

    Anything I am doing wrong?

    I’ve tried several times (4 or 5) but it seems to keep having the same problem

  20. I got it to work! I just followed your instructions! Thank you! It seems I wasn’t using the right “.tar” file. The one you provided worked for my phone, now I can update my phone again and it’s back to stock! Thank you

  21. Hello, i’m having trouble. I’ve had my S4 for over a year now and have never thought of rooting. I tried rooting and did successfully, but when I was uninstalling app through Titanium Backup, I guess I accidentally erased the Home button function. I did not know what to do so I tried reseting back but somehow I ended up with a factory reset phone. I want to update but my Wi-Fi won’t turn on and when I try, it gives me a security warning and tells me to reboot my device. Once I reboot my device it gives me the same error again so i’m stuck with a useless phone! I want to restore my phone back to factory, please help! Model: SAMSUNG-SGH-I337 At&T, Android Version 4.3. Kernel version: 3.4.0-1921628 Build Number: JSS15J.I337UCUEMK2

  22. Does the phone have to be rooted? and will I be able to update to android L thrugh ota later on?

  23. Ok so i just got 2 new phones and both were 4.2 wanted to update them to 4.4, on the first phone got a pass just fine on the second phone i got a fail… what to do now?

  24. ah…it makes perfect sense now (why its not updating)…and it was bugging me…i assume i might try to revert it to being locked, then update it, then unlock it again.. thanks Dhananjay for the quick responses and the suggestions.

  25. its an AT&T S4 (model no. sgh i337. All sgh i337 S4s are made for AT&T). it has been bought from ebay and it has been unlocked. i have a different carrier’s sim installed.

  26. thanks for the quick response response rakesh. i live in europe and i dont know a way to update my phone to 4.4.4. every time i try i get an error. any suggestion might really help

  27. does anyone know where can i find an original 4.4.4 firmware file to use instead of the 4.4.2 that is linked here?

  28. The symptoms do point to that but I have been through a similar situation with my S3 long ago. Try this: pull out the battery, wait for a couple of minutes, reinsert the battery and try again.

    It might also be a hardware issue. I mean the power button might not be working.

  29. Battery is fully charged. Computer does not even recognize phone and won’t charge when put on a charger. I believe that I may be hard bricked. Is it correct to assume this?

  30. Make sure the battery has some juice left on it. Since you said you see no sign of activity like power up and even boot screen, I think it’s the battery issue. You should try a different battery.

  31. I successfully got a pass message after installing, but now I can’t get the phone to do anything…charge, start up, etc. Just a paper weight at the moment. Can’t even start it in download mode again. Please help!

  32. Everything is fine now. I was able to successfully upgrade to 4.4.2. Thank you so much for such a detailed explanation and the firmware download link.

  33. Please disregard my previous message. I was successfully able to upgrade the firmware to Android 4.4.2 however now the WiFi does not work. Its icon on the top notifications bar is kind of “disabled green” and when I go to settings->wifi, it says “Turning on” but never turns it on.

  34. No, I am trying to upgrade from Android 4.2 to Android 4.4 and I get that error. It this something related to the baseband version or the build number?

    My Galaxy S4 (AT&T) has baseband version I9500ZSUAMDF and build number JDQ39.I9500ZSUAMDF

  35. I am getting the following error after clicking on the “Start” button in Odin. What could be wrong?

    NAND Write Start!!

    Complete(Write) operation failed.

  36. I have already root the phone using Towelroot and make sure I have rooted using rootchecker.
    But still, when I use safestrap, the “root to recovery” is greyed out even after I pressed “install Recovery”. Would you give any suggestion? I am aiming to install Phoenix rom on my GS4.

  37. Do not try installing a custom recovery over a locked bootloader. The bootloader on AT&t and Verizon variants are locked and so you will not be able to install a recovery.

    Safestrap should work for you though if you have root on the device.

  38. what should i install on S4 AT&T NC1? I have tried safetrap, CMW, Philz recovery but they all refuse to unlock that bootloader … sighhhhhhhh … any suggestion?

  39. Hi again Rakesh, Is there a way to update the firmware on a rooted phone?. My i337 has been rooted, I’m guessing this is the reason why I can’t update from firmware NC1 to Ni1. If this is the case can you please explain to me how I can update the firmware for my phone?


  40. Hi Rakesh I appreciate that you responded and provided some good advice. Now I have a new issue, I tried upgrading from my I337UCUFNC1 to the newly released I337UCUFNI1 firmware, but for some reason there was a failure in the process, so therefore my phone remained with NC1 fw. Do you have a link where I can locate & download NI1, so I can manually install it?

    Thank You,

  41. I just checked my phone’s firmware version, it’s I337UCUFNC1. This might be a silly question, but with KK 4.4.3 & KK 4.4.4 either out now or soon, can you tell me what’s the difference between my current firmware I337UCUFNC1 and what I await with the recent ATT firmware update?. I’m a bit skeptical to make the plunge, because my last update to KK 4.4.2 has made my phone a lot worst than the previous JB 4.3.

    Thank You

  42. Hi, you can easily find if this firmware version is greater that one installed on your phone. Go to Settings> About device and match compare the build number to I337UCUFNB1.

    If you find it newer, you can go with it.

  43. Hi I am new to this site, but as I was following this thread I couldn’t help but wonder if this version of KK 4.4.2 is a fix, for the current 4.4.2 KK that that I have already on my GS4 i337?. I upgraded to KK 4.4.2 around late Feb, early Mar, with some truly bad results. I’ve been experiencing some horrendous bugs such as, lag time (when turning the screen on, once it goes black), a lack of touch response, and screen freezing as well. This all happens daily, with the solution to my problems so far is only rebooting the phone (After the reboot the phone is fine, until the aforementioned occurs again). 4.3 was a battery drainer, but at least I was able to use my phone consistently through out the week without having to reboot once. So my questions are is this a FIX to my phone issues, and if not do you know if the soon to be released KK 4.4.3 & 4.4.4 will be a FIX to these issues?

    Thank You

  44. No. Actually, AT&T does not make its firmwares public. I searched a lot but no avail. If I find something, I would contact you myself.

  45. Hi, it’s true that the AT&T has released 2 new updates but unfortunately we do not have any links or firmware download yet.

  46. Hey rakesh, how is it going man. There is a new update out for the i337 s4. Do you have the link. Sorry for the errors in my first and second post.

  47. After the download is complete will it factory reset my phone? Like will it delete any apps, etc.

  48. Hello rakesh.Can I install back the software which I was using before. That is the att ucufnb1.

  49. Hello rakesh. I have updated the my phone but am getting this triangle sign message saying that unauthorized actions have been detected.

  50. Hello rakesh, I have updated my phone, but I noticed am getting this message saying unauthorized actions have been detected please restart phone to undo any unauthorized changes.What should I do ?

  51. Thanks for this. For whatever reason, my phone will not update via OTA, and AT&T hasn’t been any help at all.

  52. actually i am having a camera issue !! the rear camera shows black screen and i tried many ways to set it but it couldnt be solved !! can you help me ??

  53. Hello rakesh. If I root my phone do I see a better performance, in terms of mobile Internet working better among other things. And when is the new update coming out? Thanks

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  55. Hi rakesh could you send me the instructions how to root the sghi337, and which one of the custom rom is the best one?

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