<--Google Page ads-->

Install Omega Jelly Bean 4.2.1 Custom ROM for the Samsung Galaxy S3 I9300 (Android 4.2.1 XXUFMB3 based ROM)

The Android 4.2.1 Jelly Bean ROM has been leaked for the Samsung Galaxy S3 and developers have already started to work with it in order to release new custom ROMs for this device. This post will teach you how to flash the OMEGA Jelly Bean custom ROM on your Galaxy S3 smartphone. Make sure to read the entire post and don’t skip any steps that are listed below.

OMEGA Jelly Bean ROM is based on the Android 4.2.1 Jelly Bean XXUFMB3 leaked firmware. It packs the stock XXUFMB3 kernel, XXEMB1 modem, the boot animation has been changed to OmegaDroid Walk, it installs BusyBox, SuperSU, CWM Manager, init.d support, AROMA installer, Full Wipe option is also included. You can find out more in the tutorial guide below.

If you want to install this custom ROM on your Galaxy S3, then you should first take a look at the guidelines listed below. You will learn how to properly prepare your device for the updating process so that you will manage to flash Omega Jelly Bean ROM at your first attempt. Here’s what you need to know:

  • This tutorial will work only with the Samsung Galaxy S3 model number I9300. Don’t try to flash the files you find in this post on any other smartphone or tablet.
  • The SGS3 you’re about to update should be rooted and running a custom Recovery image such as ClockworkMod (CWM) or TWRP. Without these you won’t be able to flash any custom files.
  • Use the Custom Recovery mode to create a full NANDROID backup of your current custom ROM. This will set a restore point for your smartphone and you can use it in case the new Omega JB ROM doesn’t boot successfully.
  • The tutorial will ask you to ‘wipe data/ factory reset’ your device and this means that all the /system partition files will be removed. It contains installed apps, call logs, SMS and other similar data. You can backup some files using the following tools for Android: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore | AppBack for Android application. Root access is required for some of these apps.
  • Sync your Gmail Contacts with your Gmail account.
  • This is a guide for advanced users and you shouldn’t blame us in case something goes wrong resulting in a bricked device or loss of data. Read all the instructions that I have listed below without skipping any important steps.
  • Make sure that your device’s battery is charged so that the SGS3 won’t power off in the middle of the updating process.
  • In case you cannot complete the update then you should ask for more help in our comments field.

Now that you know all of the above then you should continue to the next part of this post.

How to install OMEGA Jelly Bean 4.2.1 Custom ROM for the Samsung Galaxy S3 I9300:

  1. Download the custom ROM from HERE. Save the file on your computer without extracting its contents.
  2. Connect your smartphone to your computer using the USB cable. Move the OMEGA JB custom ROM file to the phone’s internal SDcard. After the file is copied you should disconnect the phone from PC.
  3. Power off your smartphone.
  4. Boot your device into CWM Recovery mode or TWRP Recovery. NOTE: I’ve used CWM Recovery mode for this guide, but the TWRP Recovery install process is very similar.
  5. Select ‘backup and restore’ option from the main menu of the CWM Recovery mode. Create a full NANDROID backup of your current ROM, so that you’ll set a restore point for your device.
  6. Now, select ‘wipe data/ factory reset’ option. This will delete the /system partition not the internal SDcard.
  7. Next, select ‘install zip from sdcard’ and then select ‘choose zip from sdcard’. Find the ‘OMEGA JB’ ROM file and confirm its installation.
  8. When the update is complete your device will restart and boot into normal mode.
  9. Enter your Google account and take control over your device’s OS.
  10. Test the ROM and then tell us in comments which are your favorite OMEGA Features or in case you found any errors while using it.

These were all the steps that you had to take in order to flash the new Jelly Bean custom ROM on your Galaxy S3.

NOTE: in case the device doesn’t boot with the new ROM at your first attempt, then you should remove the battery and after that re-insert it when at least 5 seconds have passed. Then you will have to repeat the entire tutorial and this time you should make sure that you apply all the steps listed above. This time you should make sure that you apply the step 6 that will wipe the /system partition, as otherwise a custom ROM cannot install over a different ROM.

In case you don’t like the new ROM or your device is unable to boot with it, then you should use the NANDROID backup that you should’ve created before getting to the tutorial. If you have any other questions then please post them in the comments section below.

Samsung Galaxy S3 Articles