Samsung Galaxy S3 Android 4.1 Jelly Bean Firmware Update

CF-Auto Root I9300XXUFME3 Samsung Galaxy S3 I9300 Android 4.2.2 Jelly Bean Leak

Here’s the root method that worked on Samsung Galaxy S3 I9300 installed with the leaked Android 4.2.2 Jelly Bean firmware I9300XXUFME3. This I9300XXUFME3 is only a test firmware, unsigned and not officcially release by Samsung. For those who has installed this firmware and wants to gain root, you can use Chaifire’s latest CF-Auto root for Galaxy S3 I9300. Those who haven’t installed it yet, you can try it out and manually flash the stock UFME3 into your Galaxy S3 devices. The leaked UFME3 firmware can be found at XDA, just always remember that this is a test firmware only. Once you already installed the 4.2.2 UFME3, then simply follow the step-by-step rooting guide below.

Root I9300XXUFME3

Warning! This root method only works if your Samsung Galaxy S3 GT-I9300 that already receives the official Android 4.1.2 Jelly Bean update. Just always remember that rooting will void the warranty of your device.

Disclaimer: We and the developer of this root files shall not be held responsible if possible bricks  happens to your device. Use of this guide is solely at your own risks!

How to Root Galaxy S3 I9300XXUFME3 Android 4.2.2 Jelly Bean Leaked Firmware

  • Make sure that your phone is fully charge.
  • Back up all important files stored from the phone’s memory such as contacts, messages, pics, videos and etc.
  • Use Windows based computer or laptop, Odin will not work on MAC and LINUX.

Download Chainfire’s CF-Auto Root for Samsung GT-I9300 Galaxy S3 – CF-ROOT (consider a donation to Chainfire for continued development)

Install the latest Samsung Galaxy S3 USB driverlink
Odin Flasher Tool for Galaxy S3 Odin3_v3.07. link

Step 1. Extract the downloaded CF-Auto-Root-m0-m0xx-gti9300.zip so that you’ll get the CF-Auto-Root-m0-m0xx-gti9300.tar.md5 Odin flashable file. You can use Winzip, 7zip or any extracting tool you have in your computer.
Step 2. Run Odin3_v3.07.exe in your computer
– Make sure NOT TO CHECK this option “Re-Partition”. Leave  others checked.

Step 3. Click on the PDA button the browse and select the CF-Auto Root tar file.

PDA button: “CF-Auto-Root-m0-m0xx-gti9300.tar.md5

CF-Auto ROOT Samsung GT-I9300

Step 4. Set your phone in download mode (Turn off phone, then hold Volume Down+Home+Power button simultaneously) Then it ask you to press a Volume Up button to continue.

Samsung Galaxy S3 Download Mode

Step 5. Connect the phone to your computer via USB cable. You will then see an ID:COM number which is being highlighted in color blue and a word “Added!” in Odin, it indicates that your device is recognized with Odin. If you can’t see such indications, make sure to re-install the driver correctly and check your USB cable and your computer’s USB port for possible issues.

Step 6. Hit the “START” button to begin installing root on your Galaxy s3.

Step 7. Wait until it finishes flashing, you can see a word “PASS” once it’s successfully completes.
This process will only takes around 30 seconds to complete or until the phone completely reboots.

Done! remove the phone from computer connection.

NOTE: Sometimes the device does *not* boot into recovery mode and root your device. Just do the entire procedure again if this happens. If it still will not install root and such, make sure that in Odin“Auto Reboot” is not checked. Then after flashing, pull the battery, and boot with VolUp+Home+Power button to boot into recovery manually. This willstart the install process.

Fixing possible errors while installing root

Okay, I followed the instruction carefully above but this is what on Odin says:
Now it’s been an hour and nothing has happens.

CF-Root-SGS3-v6.4.tar.md5 is valid.
Checking MD5 finished Sucessfully..
Leave CS..
<ID:0/004> Odin v.3 engine (ID:4)..
<ID:0/004> File analysis..
SetupConnection..
Initialzation..
<ID:0/004> Get PIT for mapping..
<ID:0/004> Firmware update start..
<ID:0/004> recovery.img

The flashing will take just around less than a minute or more.
If the above issues occurs,. Disconnect the phone from the USB cable, this time remove the phone’s battery after a few seconds and replace it back. Then just repeat the whole process again.

How to Unroot my Samsung Galaxy S3
You can easily unroot it anytime you may want to. Just flash or install back the official Galaxy S3 GT-i9300 stock firmware such as the I9300XXEMC2 or any later updates.

Does this root method works on your Samsung Galaxy S3 runs with 4.1.2 I9300XXUFME3? Just tell if this root method has failed to work or any issues you might encountered.