Install Leaked Android 4.4.2 UCUFMLD Firmware on AT&T Galaxy S4

Android 4.4.2 KitKat OS is finally here for the AT&T users of the Samsung Galaxy S4 smartphone. Samsung had developed the OTA update and even though the same isn’t yet available, we will be checking on how to flash a leaked version of the OTA build – dubbed as UCUFMLD – on your Galaxy S4 I337. So this tutorial will take you through the manual update procedure of official – though still leaked – Android 4.4.2 KitKat UCUFMLD firmware on AT&T Galaxy S4.

A leaked software update represents and official OS that hasn’t been yet OTA rolled out. So, even though Samsung released the UCUFMLD OS, AT&T is still keeping this update away from the Galaxy S4 users. Anyway, since we have the firmware file, we can safely show you how to manually install the same on your Android device. Again, the UCUFMLD Android 4.4.2 KitKat OS represents the official update expected by all of us and not another custom ROM firmware. Because of that, for completing this guide you will not have to use complex or custom apps that might damage your device.

Anyway, this is still a manual flashing procedure, so the best will be to check all the guidelines described here. Else, you can somehow mess things up which means that you can end up in bricking your Galaxy S4. Therefore avoid the unpleasant situations by consulting the present step by step guide. The best is that since UCUFMLD Android 4.4.2 KitKat OS is the official update, by installing the same you will not lose the warranty of your SGS4 I337. Furthermore, on this tutorial it isn’t required a rooted Android device.

By the way, the procedure from below can be applied for both rooted and un-rooted Galaxy S4 as the UCUFMLD Android 4.4.2 OS will anyway reinstall the factory restrictions on your phone. Furthermore, after following this guide, if you own a rooted device, the root access will be revoked and the bootloader relocked. Because of that, updating with UCUFMLD OS means that you can restore the warranty of your Samsung Galaxy S4 – in case the warranty has been voided (usually that happens when gaining root access or when updating with a custom ROM software).

As for the UCUFMLD KitKat update, you should know that it has been leaked only a few moments ago. Also, according to those who have already flashed the firmware on their AT&T Galaxy S4, the ROM is smoothly running as there are no bugs, issues or things that aren’t working properly. Furthermore, the OS comes with several stability improvements along with all the Android 4.4.2 features, apps and capabilities that are currently available only for the Nexus devices.

If you want to enjoy all that ahead of OTA release, do flash the leaked version of the KitKat OS. As you will see, the installation procedure can be safely completed even by a newbie as Odin will be used. Odin is an official app, developed by Samsung and used especially on this type of operations. But before starting the proper update guide, let’s take a look over the pre requisites from below – don’t go any further without reading the lines from below.

  • You need to backup your data which is saved on the internal storage memory of your device. I know that it is unlikely to lose your data while using Odin for flashing an official update, but in rare cases the system is wiped or the data gets corrupted.
  • So, for avoiding these unpleasant situations, you should use suitable backup and restore apps from Google Play (don’t worry, the tools are free distributed ones) for saving your market apps, contacts, text messages, personal info and accounts, EFS folder and everything else you might need or use afterwards.
  • You need to use a Windows based computer, because Odin can be installed only on the same; furthermore your AT&T Galaxy S4 and its USB cable will also be required.
  • On the computer and preferable also on your phone you need to deactivate the security protection by temporarily disabling the antivirus, antimalware and Firewall programs.
  • A connection between your handset and your computer will have to be established; because of that now you should enable USB debugging on your device by going to “menu – settings – developer options”.
  • If your phone gets turned off in the middle of the update operation you will risk in bricking the same. Because of that, before going any further, check the battery status of your smartphone: if there is less than 60% power left plug in the charger.
  • The Android 4.4.2 KitKat UCUFMLD firmware has been leaked only for the Samsung Galaxy S4 – AT&T I337 model. So, the steps from below are compatible only with the mentioned Android device.

How to Install Leaked Android 4.4.2 UCUFMLD Firmware on AT&T Galaxy S4

  1. From here download the update file and place the same on your computer.
  2. On the same computer download Odin.
  3. Also, install Galaxy S4 drivers on your PC; you can do that by using Samsung KIES.
  4. Now, unzip Odin and install the program.
  5. Also, unzip the firmware file on the same folder as Odin.
  6. Run Odin on your PC.
  7. Turn off your phone as you need to reboot it in download mode.
  8. For download mode press and hold power, volume down and home buttons at the same time for a few seconds.
  9. Connect your Galaxy S4 with your computer via USB cable.
  10. On Odin now you should see the “added” message displayed; also the ID:COM section should be yellow or blue.
  11. If not, you will have to unplug the USB cord and close Odin. Try to reinstall the drivers on your PC and then repeat the steps from above.
  12. Up next, from Odin you need to select the “PA” option.
  13. From the window that will be displayed select the Android 4.4.2 KitKat UCUFMLD leaked update file.
  14. Apply the ROM on your Galaxy S4 by clicking on the “start” button (don’t make any other changes on Odin).
  15. Wait while the flashing process is running.
  16. In the end, if everything went as expected, on Odin the “pass” message will be displayed and the ID:COM section will turn green.
  17. Good; now unplug the USB cord and reboot your smartphone as you are done.

Congratulation, you have finally updated your AT&T Samsung Galaxy S4 I337 to official Android 4.4.2 KitKat OS. Remember that the UCUFMLD firmware is only the leaked software, so the ROM isn’t yet OTA available for your phone. That was all for now, but stay close as further tutorials will be developed for your Android device.

  • James D Polwort

    For step 12, there is no PA button. I see a PA button with a check-box located to the left. I clicked on that, and went to the Odin folder, but the file (firmware file), was not listed in my Odin folder. It has an .exe extension, and Odin is looking for certain file extensions, (i.e. .tar, .md4, etc.). Please modify your instructions, as I do not want to risk bricking my phone (as I have done in the past). The fact that you have no comments, makes me wonder if this procedure works.

    • Polwort

      Typo: From Odin 3.9 – I see an AP option; no PA. Is that a typo on your part? Also, you didn’t indicate what should be check marked or not. Do I use the default check marks?