Leaked Android 4.4.2 KitKat Firmware for AT&T Galaxy S4 SGH-I337 (I337UCUFMLD)

LEAKED FIRMWARE INFO

Firmware Version	I337UCUFMLD
Android Version	Android KitKat 4.4.2
Is this Official?	NO! This is a leaked firmware, not yet released by Samsung.
Stability	Good Enough for Daily Use.
Credits	designgears

Known Bugs/Issues

Random re-boots while using anything related to video codecs, i.e. Video recording and video playback

WARNING!

This leaked test firmware contains a new bootloader due to which downgrading to previous stock firmwares WILL NOT BE POSSIBLE.

As of yet, root CAN NOT be retained or acquired in this leaked firmware.

Warranty may be void of your device if you follow the procedures given on this page.

You only are responsible for your device. We won’t be liable if any damage occurs to your device and/or its components.

AT&T GALAXY S4 SGH-I337 OFFICIAL KitKat 4.4.2 FIRMWARE

Before you begin with guide instructions below, make sure your android device is adequately charged — at least 50% battery of the device.

STEP 0: CHECK DEVICE MODEL NO.

To make sure your device is eligible with this, you must first confirm its model no. in ‘About device’ option under Settings. Another way to confirm model no. is by looking for it on the packaging box of your device. It must be SGH-I337!

Do not use the procedures discussed here on any other Galaxy S4 (including the Galaxy S4 variant at Sprint, Verizon, US Cellular, T-Mobile and other International variants) or any other device of Samsung or any other company. You have been warned!

STEP 1: BACKUP YOUR DEVICE

Back up important data and stuff before you start playing around here as there are chances you might lose your apps and app-data (app settings, game progress, etc.), and in rare case, files on the internal memory, too.

For help on Backup and Restore, check out our exclusive page on that linked right below.

► ANDROID BACK UP AND RESTORE GUIDE: APPS AND TIPS

STEP 2: INSTALL LATEST DRIVER

You must have proper and working driver installed on your windows computer to be able to successfully flash this firmware on your AT&T Galaxy S4. In case you’re not sure, follow the link below for a definitive guide for installing driver for your Galaxy S4 on your computer.

► SAMSUNG GALAXY S4 DRIVERS INSTALLATION GUIDE

STEP 3: INSTALLATION INSTRUCTIONS

DOWNLOADS

Download the firmware file given below.

FIRMWARE ZIP FILE

DOWNLOAD LINK | File name: I337UCUFMLD_OneClick.zip (1.5 GB)

STEP-BY-STEP GUIDE

Important Note: Backup important files stored on internal SD card of your device, so that in case a situation arises requiring you to do a factory reset after flashing the leaked firmware, which might delete internal sd card too, your files will remain safe on PC.

Extract/Unzip the Firmware zip file, I337UCUFMLD_OneClick.zip on your computer (using 7-zip free software, preferably) to get this file: I337UCUFMLD_OneClick.exe
Disconnect the Galaxy S4 from PC if it is connected.
Double-click the I337UCUFMLD_OneClick.exe file to open Odin with the firmware file already loaded.
Boot your AT&T Galaxy S4 into Download Mode:
- Power off your phone first and wait for 6-7 seconds after display is off
- Press and hold these 3 buttons together until you see Warning! screen: Volume Down + Power + Home
- Press Volume Up now to continue to Download Mode
Connect your Galaxy S4 to PC. Odin window will show an Added!! message in bottom left box. Odin’s screen would look like this:

If you don’t get the Added! message, here are some troubleshooting tips:
- Make sure you have installed driver for Galaxy S4 as said above.
- If you have already installed driver, then uninstall them and re-install back.
- Connect using a different USB port on your PC.
- Try a different USB cable. The original cable that came with your phone should work best, if not, try any other cable that’s new and of good quality.
- Reboot phone and PC and then try again
Click the Start button to begin flashing leaked firmware on your AT&T Galaxy S4 SGH-I337, and wait until you see a PASS! message in Odin’s top left box.
When you get PASS! message, your phone will restart automatically. You can then disconnect your phone from PC.

If you see FAIL message instead of the PASS in Odin’s top left box, that’s a problem. Try this now: disconnect your Galaxy S4 from PC, close Odin, remove phone’s battery and put it back inside in 3-4 seconds and then repeat from Step 3 of this guide again.

Also, If device is Stuck at setup connection or on any other process, then too, try this: disconnect your S4 from PC, close Odin, remove phone’s battery and put it back inside in 3-4 seconds then repeat from Step 3 of this guide again.