Owners of Samsung Galaxy S3 with model SGH-i747M can now install Android 4.1.1 Jelly Bean firmware build UMBLL1 manually. It is an official update for Galaxy S3s offered by AT&T, Bell, Rogers, Telus, SaskTel and Virgin. The firmware will bring buttery smooth performance to your device, however, it’s not yet rooted.
The installation will take only a few minutes to complete but depending on the speed of your internet connection, the download may take more time than anything else. The flashing is done through the use of an application known to many as “Odin.”
- It is recommended your device has at least 80% battery left so the installation will be completed without problems.
- Enable USB Debugging.
- Backup all your data so you can retrieve them later even if things go ugly during the process.
- Never flash this firmware to Galaxy S3s with different models; make sure your device has a model number i747M.
- All custom ROMs and mods installed in your device will be swiped away during the process including ClockworkMod Recovery and TWRP Recovery.
- Flashing this firmware into your device is on you; The Droid Guy can never be held responsible for damages to your device.
- Download these files: Android 4.1.1 I747MUMBLL1 and ODIN 3.07. Extract these packages and put them into a directory you can easily find and access.
Step 1: Run Odin application as Administrator and turn your Galaxy S3 off.
Step 2: Boot your device into the Download Mode: press and hold VOLUME DOWN and HOME buttons while pressing the POWER button until Galaxy logo appears on the screen.
Step 3: Using the original USB data cable, connect your device into your computer. I assume all necessary drivers are already installed in your computer. Otherwise, your device will not be detected. To verify if there is a good connection between your device and your computer, see if one of ID:COM boxes on Odin interface turned yellow.
Step 4: Under Option section on Odin interface, you need to tick two options: Auto Reboot and F. Reset Time.
Step 5: Click PIT button and browse through the directory you have extracted contents of Android 4.1.1 i747MUMBLL1 package and look for “.pit” file. If you can find one, then the Re-Partition option should also be checked. Otherwise, leave it be.
Step 6: Click on PDA button and select file .tar file or the one with “code” in the filename.
Step 7: Click on PHONE button and select the file with “modem” in its name.
Step 8: Click on CSC button and choose file with “csc” in its name.
Step 9: You may now click on START button to begin flashing.
Step 10: Wait until the message “PASS” is displayed at the leftmost box at the top of Odin UI.
Once the installation is completed, your device will be rebooted automatically by Odin. Just wait before Samsung Galaxy logo appears before you disconnect your device. There weren’t any reported issues after the installation, if you encounter something unusual, do let us know.
[source: xda devs]