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• Android Source Team provide this guide for educational and instructional purpose, so we will not be held liable or responsible for any data lost or damage to the device during or after the ROM installation. Apply this guide only on your own risk.
• Download and install suitable USB Drivers for Samsung Galaxy S3 device on the PC. Download link for USB Drivers here.
• Enable the USB Debugging Mode on the smartphone from Settings>Developer Options.
• A full backup is required to avoid potential data delete or corruption, so backup all your important data stored into Galaxy S3 device’s internal memory.
• The Galaxy S3 device should be factory unlocked, not locked in any specific carrier.
• Ensure that the device’s battery has more than 85 % power left.
• The new official Android 4.3 (I9300XXUGML3) firmware is fully compatible with all Galaxy S3 GT-I9300 devices only. Do not use this firmware in any other incorrect versions of Android devices as it may damage or brick your device.
• To be sure about the device model verify this by navigating to Settings>>About Phone.

How to update Samsung Galaxy S3 with Android 4.3 I9300XXUGML3 Jelly Bean Firmware:

1. Download Android 4.3 XXUGML3 JB Firmware for Samsung Galaxy S3 I9300 device.
2. Download ODIN application from here.
3. Now, extract the downloaded Android 4.3 JB firmware to obtain a .tar.md5 file and some other additional files.
4. Now, extract the ODIN archive to get ODIN3 v3.07.exe and some other files.
5. Turn off the Samsung Galaxy S3 device.
6. Boot it into Download Mode. (Press and keep holding the Volume Down, Home and Power buttons in the same time until an Android icon with together with a warning triangle will be displayed on the screen and then press once again the Volume UP button).
7. Open the ODIN application on PC as an Administrator.
8. Now, by using the USB cable with the device in Download Mode connect the Samsung Galaxy S3 device.
9. When the ODIN application detects the S3 device a “Added” message will appear on the display and the ID:COM box with the COM port number will turn light blue. If the “Added” message fails to be displayed try to reinstall once again the USB drivers.
10. Now, load the extracted files in ODIN application from the extractedI9300XXUGML3 firmware folder:
11. • ·         From ODIN tap on PDA button and from there select the .tar.md5 file.
    • ·         From ODIN, tap PDA button and select the .tar.md5 file.
    • ·         From ODIN select the CSC button and chose the file named CSC.
    • ·         From ODIN click PIT button and select the file with the .pit extension.
    ·         Note: if the MODEM, CSC and .pit files are not found you should ignore these steps.
12. In ODIN application select Auto Reboot and F. Reset Time options. The Re-Partition option must rest checked only if you have a .pit file in the previous steps.
13. Now, verify once again all the steps to be done correctly.
14. Press on START button in ODIN to start the flashing process.
15. Once the new official firmware is completely installed a “PASS” message with a green color on the background will be displayed in the left top of ODIN application.
16. After that the Samsung Galaxy S3 device will get an automatically reboot to the Home screen.
17. Disconnect the USB cable from the PC.
18. These were all the steps in order to install the new official Android 4.3 I9300XXUGML3 JB firmware.
19. Verify the OS version from Settings>About Phone.