How to Root Galaxy S3 I9300 running on Android 4.3 UBUGML1

Galaxy S3 I9300 using Android 4.3 can be rooted if you want better performance, new features and other goodies. Our guide only applies to people who own this model and have updated it to the OS we mentioned via UBUGML1 firmware.

After you’ve checked the sort of model you own, you can begin the tutorial. But first, there are some things you need to know about the procedure: apart from using the right version running the firmware we told you about, you have to make sure you unroot your device if you want to restore its warranty. Because yes, your handset’s warranty will, at the end of the rooting, be lost.

As soon as your Samsung GT-I9300 is fully rooted, you will be able to experiment with many new things. Here are the ones which are the most interesting: root-only apps, new features, the possibility to get access to your device’s system files and tweaks to improve the battery life as well as customize the phone. You will also find it very easy to use MODs and underclock or overclock the GPU and CPU.Galaxy-S3-GT-i9300


As for pre-requisites, here is how they look like:

Step by step instructions

  1. The two packages that have been downloaded on your laptop need to be unzipped as well. For this, it’s best to use one of these tools: WinRar or WinZip.
  2. The most important files that will come out of this extraction are .tar.md5 and Odin3 v3.09.exe. Keep an eye on them, then do the following: turn the handset off.
  3. Next, enter the same in Download Mode. This task should be completed in the following way: press and hold, at the same time, Volume Down + Home + Power, let go of them when a warning display appears and press only Volume Up.
  4. You will then have to run, on your notebook, the Odin 3.09.exe as Admin and then use the USB cable of your I9300 to establish a connection to your laptop.
  5. Which will be successful only if this happens: the screen will have an “Added!!” message and you will spot an ID:COM box in yellow. If there’s no connection happening, we recommend you to either use another USB port or flash the USB drivers one more time.
  6. After that, it’s best to do this: tap AP. Afterwards you will need to opt for the file with the .tar.md5 extension.
  7. After you’ve selected it, you can activate F. Reset Time and Auto Reboot and then click on “Start“. By doing this, the installation of the rooting firmware will begin. When it’s finished, your phone running UBUGML1 stock firmware is going to reboot on its own and then display, in green, this message: “Pass“.
  8. Once you’ve spotted this particular message, you should do the following: take the USB cord out so that there’s no connection between the Galaxy S3 and the notebook anymore.

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Now you can fully enjoy your freshly rooted smartphone running on Jelly Bean 4.3 UBUGML1 official firmware! But what if the rooting didn’t happen? If you’re unsure, there’s always Root Checker to download from Google Play and use on your phone to verify.

You may run into rooting troubles during today’s tutorial. If that happens, all you need to do to solve them is open the Internet on your Galaxy S3 I9300 first, upgrade the SuperSU binary, open it afterwards and then make sure the KNOX notification is disabled.

Feel free to leave us questions or comments in the section below this post.