Update Galaxy S3 I9300 to XXUFMB3 Omega Android 4.2.1 Jelly Bean Custom ROM

Together with a couple of prompts from the developer responsible for XXUFMB3 Omega ROM, we created a tutorial on how to update, using this particular tool, Samsung’s Galaxy S3 I9300 to Android 4.2.1 Jelly Bean.

The ride will be fun and filled with useful tips and tricks.


The first of them are the pre-requisites, of course. We always recommend our readers to follow them all the way through in each of our guides, because of their extreme importance.

The ones which are indicated for the Galaxy S3 GT-I9300 are as follows: root the handset (and get a recovery image, as well), turn USB Debugging on, charge the battery, make a backup, use a factory unlocked device and install the USB Drivers deserving of the smartphone. Don’t forget to save your phone’s settings and your important applications.

This ends the requirements for today and marks the beginning of our tutorial. Follow the steps described in detail below and you won’t need anything else.Galaxy-S3-GT-i9300


  1. Step one shall require you to download one file. You’ll find it under the name of . Once you download it on your laptop, you will have to connect the S3 GT-I9300 to it and move the file to the handset’s memory card, choosing the root as location.
  2. Step two will tell you to do the following: switch the smartphone off. While it’s dead, you need to unplug it from the comp and then boot the device into Recovery Mode. We generally use this method: we turn the handset on while simultaneously selecting the keys labelled Home, Volume Up and Power, at the same time.
  3. While it’s in that mode, the third step will tell you to start a phone’s data wipe and then press Power to choose the option called Flash zip from SD card.
  4. [sc name=”banner-jos”]The fourth step will then arrive on the scene and instruct you this: opt for Choose zip from SD card via Power. The Android 4.1.2 ROM zip file will need to be chosen; do that by pressing the button labeled Power again.
  5. For step number five you shall have to initiate the installation process. The latter will debut in a couple of seconds. What needs to be done now is as follows: go to +++++Go Back.
  6. The sixth step will prompt you to choose the system restarting to reboot the handset into the update. Have patience for around 5 minutes. After the time has passed, the Samsung Galaxy S3 I9300 will boast the Omega Android 4.2.1 XXUFMB3 Jelly Bean Custom Firmware. You will find it in the smartphone’s “About phone” section.