The international version of Samsung Galaxy S3 (GT-I9300) has just received a new Android 4.3 Jelly Bean update with base firmware I9300XXUGNB4. The new official update is now available for users in New Zealand as an Over-The-Air (OTA) update as well as through Samsung KIES.
Firmware details
PDA: I9300XXUGNB4
CSC: I9300NZCGNB1
MODEM: I9300XXUGNB1
Version: Android 4.3
Build date: Feb 17, 2014
Regions: New Zealand
Samsung Galaxy S3 I9300 users who missed the OTA update notification or unable to access the update over Samsung KIES, can now download and install the same manually using our step-by-step guide.

Pre-requisites
1. Install USB Drivers for Samsung Galaxy S3 on the computer.
2. Enable USB Debugging Mode on the phone by navigating to Settings >> Developer Options.
3. Make a backup of all your important data before following the guide.
4. Ensure the battery of the phone is charged more than 80 percent.
5. The Android 4.3 XXUGNB4 Jelly Bean firmware is compatible only with the 3G version of Galaxy S3 (GT-I9300). Applying this to any incorrect variant might brick the device. Verify the model number of the Galaxy S3 by navigating to Settings >> About Phone.

Files Required
1. Android 4.3 XXUGNB4 Jelly Bean Firmware (Mirror Link) for Galaxy S3 I9300
2. Odin 3.07

Steps to Update Galaxy S3 I9300 with Android 4.3 XXUGNB4 Jelly Bean Firmware
Step 1: Extract Firmware zip file using WinRAR/7-Zip/WinZip or any other extracting tool, you will get a .tar.md5 file and some other files (optional).
Step 2: Extract Odin zip file and you will get Odin3 v3.07.exe along with few other files.
Step 3: Switch off the Galaxy S3.
Step 4: Boot the device into Download Mode by pressing and holding Volume Down, Home and Power buttons together until a construction Android robot icon with a warning triangle appears on screen. Now press the Volume Up button to enter Download Mode.
Step 5: Run Odin on the computer as an Administrator.
Step 6: Connect the Galaxy S3 to the computer using USB cable while it is in the Download Mode. Wait until Odin detects the device. When the device is connected successfully, the ID: COM box will turn to light blue with the COM port number. Additionally, the successful connected will be indicated by a message saying Added.

Step 7: Select the following files in Odin from extracted I9300XXUGNB4 firmware folder:

• Click the PDA button and select the .tar.md5 file.
• Click the Phone button and select file with MODEM in its name. Ignore if there is no such file.
• Click the CSC button and select file with CSC in its name. Ignore if there is no such file.
• Click the PIT button and select the .pit file. Ignore if there is no such file.

Step 8: In Odin, enable Auto Reboot and F. Reset Time checkboxes. Also, ensure the Re-Partition checkbox is chosen only if a .pit file was chosen in the previous step.
Step 9: Verify everything suggested in Step 7 and Step 8 is done correctly. Then hit the Start button to begin the installation process.
Step 10: Once the installation process completes, your phone will restart and soon you will see a PASS message with green background in the left-most box at the very top of the Odin. You can now unplug the USB cable to disconnect your device from the computer.

Samsung Galaxy S3 I9300 should be now updated with Android 4.3 XXUGNB4 Jelly Bean official firmware. Head over to Settings >> About Phone to verify the software version running on the device.

Note: If Galaxy S3 I9300 stuck at booting animation after Step 10 then go to recovery mode (press and hold the Volume Up, Home and Power buttons together) and perform Wipe data/Factory Reset and Wipe Cache Partition task before selecting reboot system now function. In recovery mode use Volume keys to navigate between options and Power key to select the option. Please note, performing wiping task will erase your device internal memory data and not external SD card data.

Read also: How to Root Galaxy S3 I9300 on Android 4.3 Jelly Bean Firmware

The International version of Samsung Galaxy S3 with model number GT-I9300 has received Android 4.3 Jelly Bean update firmware. The new official firmware is currently available as an Over-The-Air (OTA) update as well as through Samsung KIES.
Samsung Galaxy S3 I9300 users who have already updated their devices with Android 4.3 Jelly Bean, may root their devices using the tutorial below.
This tutorial uses CF-Auto-Root file released by Elite Recognized XDA Developers, Chainfire. The CF-Auto-Root file allowing Galaxy S3 users to root their devices easily without depending on the firmware. It completely supports Android 4.3 Jelly Bean and future firmware as well. Head over to the CF-Auto-Root main thread to learn more about the root method.
Disclaimer: Rooting voids the warranty of your device. We and the developer of this rooting procedures shall not be held responsible if any undesirable outcomes may happen to your device. use of this root guide is solely at your own risk!
Pre-requisites
1. Install USB Drivers for Samsung Galaxy S3 on the computer.
2. Enable USB Debugging Mode on the phone by navigating to Settings >> Developer Options.
3. Make a backup of all your important data before following the guide.
4. The Galaxy S3 should be factory unlocked and not locked to any particular carrier.
5. Ensure the battery of the phone is charged more than 80 percent.
6. The CF-Auto-Root file works only on the international version of Samsung Galaxy S3 (GT-I9300). Applying this to any incorrect variant might brick the device. Verify the model number of the Galaxy S3 by navigating to Settings >> About Phone.

Files Required
1. CF-Auto-Root for Galaxy S3 I9300 (CF-Auto-Root-m0-m0xx-gti9300.zip)
2. Odin 3.07 (Mirror Link)

Steps to Root Galaxy S3 I9300 Running on Android 4.3 Jelly Bean Firmware
Step 1: Extract CF-Auto-Root and Odin 3.07 files using WinRAR/7-Zip/WinZip or any other extracting tool.
Step 2: Switch off the Galaxy S3. Then boot the device into Download Mode by pressing and holding Volume Down, Home and Power buttons together until a construction Android robot icon with a warning triangle appears on screen. Now press the Volume Up button to enter Download Mode.
Step 3: Launch Odin on the computer as an Administrator.
Step 4: Connect the Galaxy S3 to the computer using USB cable while it is in the Download Mode. Wait until Odin detects the device. When the device is connected successfully, the ID: COM box will turn to light blue with the COM port number. Additionally, the successful connected will be indicated by a message saying Added.

Note: If the Added message does not appear, then try re-install USB drivers or changing the port on the computer.

Step 5: In Odin, click the PDA button and select the CF-Auto-Root-m0-m0xx-gti9300.tar.md5 file.
Step 6: Verify that Auto Reboot and F. Reset Time checkboxes are selected in Odin. Also, ensure the Re-Partition option is NOT selected.
Step 7: Double-check and click Start in Odin. The installation process will now begin.
Step 8: Once the installation process is completed, your phone will restart and soon you will see a PASS message with green background in the left-most box at the very top of the Odin. You can now unplug the USB cable to disconnect your device from computer.

Samsung Galaxy S3 I9300 running on Android 4.3 Jelly Bean is now rooted successfully. Open the app drawer of the phone and check for an app called SuperSU. Verify the root status of the device by downloading Root Checker app from Google Play Store.

How to Fix "Unfortunately, SuperSU has stopped"?
Step 1: Download and install the latest APK of SuperSU on your device.
Step 2: Open SuperSU app (update the binary if prompted) and allow it to disable KNOX.
Step 3: Reboot your device.

Thank's to all fellas at XDA who first tried out this rooting technique. This method was originally posted via XDA-Developers original thread.

Click here to know How to Update Galaxy S3 I9300 with Android 4.3 Jelly Bean official firmware.

Samsung has rolled out another Android 4.3 Jelly Bean update with base firmware I9300XXUGNB6 for the international version of Galaxy S3 (GT-I9300). The new official firmware is now available as an Over-The-Air (OTA) update as well as through Samsung KIES.
Firmware details
PDA: I9300XXUGNB6
CSC: I9300OJVGNB3
MODEM: I9300XXUGNA8
Version: Android 4.3
Build date: Feb 25, 2014
Regions: United Arab Emirates, Afghanistan, Algeria, Egypt, Iran, Iraq, Kenya, Libya, Morocco, Nigeria, Pakistan, Saudi Arabia, South Africa, Tunisia, Turkey
Samsung Galaxy S3 I9300 users who missed the OTA update notification or unable to access the update over Samsung KIES, can now download and install the same manually using our step-by-step guide.

Pre-requisites
1. Install USB Drivers for Samsung Galaxy S3 on the computer.
2. Enable USB Debugging Mode on the phone by navigating to Settings >> Developer Options.
3. Make a backup of all your important data before following the guide.
4. Ensure the battery of the phone is charged more than 80 percent.
5. The Android 4.3 XXUGNB6 Jelly Bean firmware is compatible only with the Galaxy S3 (GT-I9300). Applying this to any incorrect variant might brick the device. Verify the model number of the Galaxy S3 by navigating to Settings >> About Phone.

Files Required
1. Android 4.3 XXUGNB6 Jelly Bean Firmware (Mirror Link) for Galaxy S3 I9300
2. Odin 3.07

Steps to Update Galaxy S3 I9300 with Android 4.3 XXUGNB6 Jelly Bean Firmware
Step 1: Extract Firmware zip file using WinRAR/7-Zip/WinZip or any other extracting tool, you will get a .tar.md5 file and some other files (optional).
Step 2: Extract Odin zip file and you will get Odin3 v3.07.exe along with few other files.
Step 3: Switch off the Galaxy S3.
Step 4: Boot the device into Download Mode by pressing and holding Volume Down, Home and Power buttons together until a construction Android robot icon with a warning triangle appears on screen. Now press the Volume Up button to enter Download Mode.
Step 5: Run Odin on the computer as an Administrator.
Step 6: Connect the Galaxy S3 to the computer using USB cable while it is in the Download Mode. Wait until Odin detects the device. When the device is connected successfully, the ID: COM box will turn to light blue with the COM port number. Additionally, the successful connected will be indicated by a message saying Added.

Step 7: Select the following files in Odin from extracted I9300XXUGNB6 firmware folder:

• Click the PDA button and select the .tar.md5 file.
• Click the Phone button and select file with MODEM in its name. Ignore if there is no such file.
• Click the CSC button and select file with CSC in its name. Ignore if there is no such file.
• Click the PIT button and select the .pit file. Ignore if there is no such file.

Step 8: In Odin, enable Auto Reboot and F. Reset Time checkboxes. Also, ensure the Re-Partition checkbox is chosen only if a .pit file was chosen in the previous step.
Step 9: Verify everything suggested in Step 7 and Step 8 is done correctly. Then hit the Start button to begin the installation process.
Step 10: Once the installation process completes, your phone will restart and soon you will see a PASS message with green background in the left-most box at the very top of the Odin. You can now unplug the USB cable to disconnect your device from the computer.

Samsung Galaxy S3 I9300 should be now updated with Android 4.3 XXUGNB6 Jelly Bean official firmware. Head over to Settings >> About Phone to verify the software version running on the device.

Note: If Galaxy S3 I9300 stuck at booting animation after Step 10 then go to recovery mode (press and hold the Volume Up, Home and Power buttons together) and perform Wipe data/Factory Reset and Wipe Cache Partition task before selecting reboot system now function. In recovery mode use Volume keys to navigate between options and Power key to select the option. Please note, performing wiping task will erase your device internal memory data and not external SD card data.

Read also: How to Root Galaxy S3 I9300 on Android 4.3 Jelly Bean Firmware