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How To Root Galaxy S3 Android 4.2.1 XXUFMB3 Firmware – Guide


The Samsung Galaxy S3 has just received Android 4.2.1 Jelly Bean update through a leaked firmware having version number I9300XXUFMB3 that bumps a decent bunch of features such as improved ripple effect on lockscreen, new lockscreen with widgets, Daydream app, improved notification center and voice command (control various parts of phone with voice). Of course it’s leaked firmware but works perfectly, those of you have updated your Galaxy S3 to Android 4.2.1 XXUFMB3 firmware and now looking for root access to gain super user rights, here can do so.

This guide shows you how to root I9300XXUFMB3 Android 4.2.1 firmware on Galaxy S3 using the CF-Auto-Root tool developed by Chainfire (senior XDA developer), this rooting tool install custom recovery on the phone, then reboot phone into recovery, in recovery mode CF-Auto-Root tool root your Galaxy S3 and then restore the stock recovery back to phone.

Use a Windows PC with USB Galaxy S3 driver installed, you can use Samsung KIES to install drivers but before rooting you should disable KIES. Rooting doesn’t wipe anything but just for safety, you should backup everything. You can sync your contacts with Gmail account and for messages use SMS apps, lastly use the carbon Android app to backup apps and data.

DISCLAIMER: Please proceed the below guide at your own risk, Android Egis will not be held responsible if your device lost data or gets damaged following this guide.

Instructions

Step #1: Download the Rooting Package (CF-Auto-Root-m0-m0xx-gti9300.zip) to your PC.

Step #2: Unzip the downloaded rooting package zip file into a folder.

Step #3: Open the folder where you’ve unzipped the above file and run Odin3-v1.85.exe file.

Step #4: Turn off your Galaxy S3 and reboot into download mode by holding down home, volume down and power buttons.

Step #5: Once you’re in download mode plug the device to PC using USB cable. Odin will detect the device, ID:COM will turn yellow and a message saying ADDED will appear. (Note: If Odin doesn’t detect the device, make sure that USB drivers are properly installed on your computer).

Step #6: Click on PDA Button and locate CF-Auto-Root-m0-m0du-gti9300t.tar.md5 from the folder where you’ve unzipped above file in the step 2. (Note: Don’t make any change, just make sure that re-partition is unchecked).

Step #7: Click on Start button to start installation, once the installation done, your device will reboot itself and you’ll see message saying PASS (Note: If Odin refuse to install the update and show message FAIL, or get stuck, close the Odin and unplug device, then pull out battery from the device for a few seconds. Then put the battery back to the device and reboot into download mode. Then install the firmware again) your phone will reboot into recovery mode, there it will root the phone and then reboot phone again.

Step #8: Unplug your Galaxy S3 I9300T from the PC.

Great job, your Galaxy S3 running Android 4.2.1 Jelly Bean firmware is rooted now. Download and install the Triangle Away app to reset the flash counter of your phone. If you experience any error, leave a comment below.

Via: XDA

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