First Follow the Link to install Android 4.3 XXUGMK7 Official Firmware On Samsung Galaxy S3.

Update Galaxy S3 I9300 To XXUGMK7 Android 4.3 Jelly Bean Official Firmware.

Now that you have installed Android 4.3 XXUGMK7 Official Firmware on your Galaxy S3 I9300, then next thing you know is to root it. Why? you have already rooted your device on previous Firmware? Well because installing an Official Firmware will erase the root access of your device and you have to root it again. Rooting allows you to get full control over your device, Stock apps and mods are good, but installing Custom Mods gives you better support and great battery life, you might need to delete some Stock apps from the device, a non-rooted device can’t do that, but a rooted one has the power to remove stock apps too.

If you are familiar with Odin and it’s working, then this tutorial might not be difficult for you. Otherwise read the whole tutorial first before trying it on your device. In this Article, we will show you How To Root Samsung Galaxy S3 On Android 4.3 XXUGMK7 Official Firmware.But before we begin, Make sure that you have battery charged over 60 % and have backed up all your important Contacts, Call Logs & Messages.It is highly recommended in case of any mishap or data loss to back up all your important data.

Disclaimer: 

The methods involved in flashing custom roms and rooting your phone is highly custom and may result in bricking your device,and has nothing to do with Google or the device manufacturers which is Samsung in our case. In case of any mishap we may not be held responsible. Follow these instructions to the letter to avoid any mishap or bricking. Make sure that whatever you do, you are doing it at your own responsibility.

Important things:.

• Enable USB debugging mode.
• Make sure that battery level is at 85% or more.
• This Tutorial is Only For Galaxy S3 I9300.
• Back-Up your Mobiles EFS Data. How To Restore and Back-Up EFS Data On Samsung Galaxy Devices.

How To Root Samsung Galaxy S3 On Android 4.3 XXUGMK7 Official Firmware.

•  Download CF-Root-SGS3-v6.4.zip  for Galaxy S3 to your computer and extract the zip file.
• Download Odin.
• Turn off your Phone and Turn it On While Pressing, Power + Volume Down + Home button until you see some text on-screen, Press Volume Up to continue.
• Make Sure that the USB drivers are installed.
• Open Odin in Computer and connect your device to PC, while it is in the Download mode.
• If your Phone is successfully connected to PC, the Odin port will turn Yellow with COM port number.
• Now Click on PDA and select the File ‘CF-Root-SGS3-v6.4.tar.‘, or the one who has the biggest size.
• In Odin, Check Auto reboot and F.Reset Options.
• Now Click the start button and wait for the process to complete.
• After the installation is complete you device will restart and once you see the Home Screen, unplug the cable.

That’s it your Samsung Galaxy S3 I9300 has been Rooted On XXUGMK7Android 4.3 Jelly Bean. Download any Root Checker app or See Super SU in app Drawer to Verify root access.