Monday, March 31, 2014

I537UCUBML2 4.3 Galaxy S4 Active I537 (AT&T) Stock Firmware

Here's the official I537UCUBML2 4.3 stock firmware for Galaxy S4 Active I537 (AT&T) for those who might need it for returning back the Galaxy S4 Active to the default official firmware or stock. The stock 1537UCUBML2 4.3 is also useful if you might have a soft-bricked Galaxy S4 Active, then this file might save your device and bring it back to life again.
I537UCUBML2 4.3 stock rom

How to manually install the I537UCUBML2 4.3 Official Android 4.3 firmware on Samsung Galaxy S4 Active

Again, this update is officially released in USA and you can simply update your Galaxy S4 Active through Samsung KIES or OTA. Below are the official I537UCUBML2 stock firmware for developers and advanced users, and can be flash using ODIN.


Disclaimer: This guide is for advance users only, if this your first time heard about this method, make a careful research first before proceeding. We shall not be held responsible if anything happens to your device by using this guide. Proceed at your own risk!

Note: This stock firmware is compatible for Galaxy S4 Active I537 (AT&T)  with the specification model number  “SGH-I537″ versions only.

Download the stock  I537UCUBML2 4.3 firmware:

Stock 4.3 ML2 - download
You may use Odin3_v3.04, v307 or Odin3_v3.09 here
Kies USB Driver here

Step 2: Prepare things  as follows:
- Use a PC or laptop that runs in Windows OS, with a good and perfectly working USB serial port.
- Use the USB cable wire for your Galaxy S4.
- Make sure that your Galaxy S4 battery is fully charge.
- Back up all important files stored from your phone’s internal memory – contacts, messages, etc.
- Remember or back up the APN settings of your device.
- Enable USB debugging from your phone’s settings. Go to Settings > Applications > Development, and tick the box that says ‘Enable USB Debugging’.
- Do a “Hard Reset” if you have a lot of 3rd party applications installed from your phone, this is useful to gain a smooth flashing. (Just make sure that you already back up all your important files before resetting your device.

Step 3: Extract or unzip the downloaded stock firmware so that you’ll get the Odin flashable .tar.md5 file. Use Winzip, winrar, 7zip or any extracting tool you had in your computer.

Step 4: Run and Configure Odin
Run Odin downloader on your computer’s desktop. Watch out the check-boxes options on the right top of Odin, ensure that the ‘RE-PARTITION’ is unchecked. Leave the ‘AUTO-REBOOT and ‘F.RESET TIME’  remains checked.
Now, click on the AP button, then select and load the single file that you have previously extracted.

AP button (single file): I537UCUBML2_Home.tar.md5
Multiples files: These comes in four individual files, such as AP, Bootloader ,MODEM and CSC. If it comes in four individual files then load it on its designated buttons.
AP button:  AP_I537UCUBML2
BL button: BL_I537UCUBML2
Phone button: CP_I537UCUBML2
CSC button: CSC_I537ATTBML2

Step 5: Reboot the Galaxy S4 Active into Download Mode.
To put your Galaxy S4  Active I537 in download mode, just simply switch it off then gently press and hold the “POWER, VOLUME DOWN and HOME” buttons simultaneously. You’ll be then prompted in a warning screen to continue or cancel.

Step 6: Connect the Phone to the Computer or Laptop
Once the phone screen shows in downloading mode, connect your phone to the PC with the USB cable. You’ll then notice the upper box in Odin that turns in yellow color., it also indicates the COM:ID where the device is being detected and a word “added!!’ on the log box. If somehow those things never showed up, check out the USB cable connection, read again from the top of this post.
Step 7: Flash it!
Once all set and ready, hit he “START” button to begin flashing.
Do not touch anything that might interrupt the process to avoid any fatal errors or failures, it may ruin your device if any interruption occurs while already in flashing status.

It may takes a couple of minutes or longer and it depends of your PC/laptop speeds. A word “PASS” will display in Odin once it finishes. If somehow you will not get the word “PASS” or just stuck in along time. Disconnect the phone, remove battery, re-insert it, check the USB connection, re-install the driver, disable Kies and any anti-virus. Set the phone in Download mode again, and repeat the whole procedure.

The phone will just automatically reboots if the firmware flashing successfully completes. Just wait until it boots up on the “Samsung” logo for a while then into an android update screen. If it still shows boot logo try rebooting and if it stays there, you need to wipe your phone.

Fixing possible issues after flashing like bootloops or just stuck in welcome screen logo

Boot in recovery mode – Press and hold Volume Up, Home and Power button. Use volume keys to select up and down and power or home key to select the option.

1. Select Wipe Data/Factory Reset
2. Next select the Wipe Cache Partition
3. Lastly select Reboot System Now to reboot your Galaxy S4 in Normal mode.
Confirm your fresh firmware installed by typing *#1234# or
Go to Settings>About Phone>Firmware info.
Check and reconfigure your APN settings when data networks connection issues encountered.

You may then confirm the newly installed firmware from your Galaxy S4 Active I537:
Tap on Settings>About Device> Firmware info or type *#1234# and see if it’s already I537UCUBML2 Android 4.3 Jelly Bean build.  That’s it! If this helps you then simply share us some love by hitting our like and share buttons. If you also have something to add, your comments and suggestions are most welcome here.


  1. Can this work on sgs4 active 19295?

  2. The 4.3 mirror is bad.

  3. Thanks for the info, its a late reply tappa but yes it does work just did it myself. After the flashing is complete it does take the phone a bit longer to boot up so it will look like its hung on the att logo but give it time and it should boot up.