I9300UBUGNK1 Android 4.3 Jelly Bean Firmware for Galaxy S3 GT-I9300 - How to Install

I9300UBUGNK1 Android 4.3 Jelly Bean Firmware Last Updated on 17-Nov-2014. You can now update the latest UBUGNK1 Android 4.3 Jelly Bean official firmware on your Samsung Galaxy S3 GT-I9300 Smartphone. Samsung recently started rolling out an OTA update about the firmware. The latest firmware build version number is I9300UBUGNK1. The Galaxy S3 I9300 already received many official Android 4.3 Jelly Bean firmware update till now and here we have the latest available official firmware. If you own the Smartphone and not yet updated this latest firmware, then update the same using our simple tutorial below. The below step by step guide will help you to download and install the latest I9300UBUGNK1 Android 4.3 Jelly Bean Firmware manually through Odin.

Root I9300UBUGNK1

If you already updated the I9300UBUGNK1 firmware and looking for an easy to follow method to root the firmware, then follow this guide- Root I9300UBUGNK1 Android 4.3 Stock Firmware On Galaxy S3 GT-I9300 - Simple Tutorial.

Samsung Galaxy S3 GT-I9300

The latest Android 4.3 Jelly Bean official firmware is definitely a great update for the Galaxy S3 users as the device has been on Android 4.1.2 Jelly Bean from a long time. The latest firmware will upgrade the android version (if your device is still running on Android 4.1.2 JB) as well as will activate many new features, changes and improvements. Check out some of the new features and changes that coming with this latest update from below.

New features and changes in Android 4.3 Jelly Bean:

Galaxy S4 like lockscreen, Multi-pages feature on lockscreen, support widget on lockscreen, Tabbed UI in Settings, Daydream feature, Voice control feature for apps like phone, camera, music player and so on, Hands-free Mode, New Notification Panel with 2 pages, ANT+ support, TRIM support, Camera Improvements, Move apps to SD feature, New Samsung keyboard, Changed icons for some Samsung apps, Smoother TouchWiz, Adapt display, Adapt sound, New S-Voice from Galaxy S4, Full screen mode in Samsung apps and many more.

Also Check: Samsung Galaxy S3 GT-I9300 Full Specifications and Features   

So, want to update your Galaxy S3 I9300 to the latest I9300UBUGNK1 Android 4.3 Jelly Bean firmware? For official way, either you can go for  OTA (over the air) from Settings-About Phone-Software Update or download firmware through the Samsung Kies utility. However, most of us prefer manual way to update official firmware. So, in this article you’ll find step by step manual guide to update the latest Android 4.3 UBUGNK1 firmware on your Galaxy S3 I9300 through Odin.

Important Note:

"The firmware is released only for the Samsung Galaxy S3 GT-I9300 model, so don’t try this in any other android device. Check your device model number from Settings-About Phone. Also the tutorial is based on Windows PC. Follow all the pre-requisites, procedures and steps carefully to avoid breaking your phone".

Download I9300UBUGNK1 Android 4.3 Jelly Bean Official Firmware

Samsung rolled out the firmware for the following countries. The firmware which are unbranded or not locked to any carrier, no matter of which country or region, can be flashed on any Galaxy S3 GT-I9300 model.

Brazil: I9300UBUGNK1_I9300ZTOUGNK2_ZTO.zip

[Firmware for rest of the countries and carrier will be added here when available]

Previous Firmware Builds:


  • Check battery percentage, your device should have at least 60% battery power
  • Turn on USB Debugging mode, go to Settings-Developer Options-USB Debugging
  • Backup important data and settings to external storage- follow this guide
  • Install USB driver for your device on your computer- Download Samsung USB Driver

Points to be noted:

  • If you are using any Custom ROM such as- CyanogenMod, Paranoid Android, AOKP, SLIM ROMs etc, then it’ll replaced by this official Stock ROM
  • Custom Recovery (CWM or TWRP Recovery) will be replaced by Stock Recovery
  • After flashing official firmware, your device will no longer belongs to rooted device. However you can root your device any time after flashing the firmware.
All the above pre-requisites are very important and must follow before proceed to installation guide. Hope you get all the above points. Now, go through the below tutorial to install Android 4.3 I9300UBUGNK1 official firmware on Galaxy S3 I9300.

How to Install Android 4.3 Jelly Bean Official Firmware on Galaxy S3 I9300 through Odin:

  1. Download Android 4.3 UBUGNK1 Firmware for Galaxy S3 I9300 from the above list
  2. Download Odin 3.09
  3. Switch off your phone and boot Galaxy S3 I9300 into Download Mode by pressing and holding the Volume Down+Home+Power buttons (long press until the boot screen appear), now press Volume Up key to proceed to Download Mode.
  4. Extract the downloaded Odin3.09 zip file and run the Odin3 v3.09.exe file as an administrator (Right click on the .exe file and click on Run as administrator)
  5. Now connect your Galaxy S3 I9300 to your computer via USB cable
  6. In Odin3 screen, you should see a COM Port number like “0:[COM7]” at ID:COM section and “Added!” text at the message box. This means your device has been detected by Odin3.
  7. Make sure that, only the “Auto Reboot” and “F. Reset Time” options are checked.
  8. Now, extract the downloaded firmware zip file, you’ll find a firmware file with extension .tar.md5
  9. In Odin screen, click on AP (PDA in older Odin) button and select the firmware file with .tar.md5 extension (The firmware file look something like: I9300XXDLJ5_I9300ODDDLI7_INU.tar.md5)
  10. Now, click on the Start button to begin the installation process, wait few moments.
  11. Once completed, you would see “PASS!” message in ID:COM port having green background
  12. Your phone should automatically reboot after completion
  13. You can now disconnect your phone from computer
  14. Finish
So, you have just finished the tutorial to update Android 4.3 Jelly Bean official firmware on Galaxy S3 GT-I9300. If you followed everything as mentioned in the above tutorial, then your device should now running on the latest Android 4.3 Jelly Bean build version UBUGNK1. You can verify the firmware update details from Settings-About Phone. So, enjoy all the new features and improvements on your device and don’t forget to share your experience in the comment below. 


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