Galaxy S3 I9305 – Steps to Update with Jellybean 4.1 Supreme Custom ROM Firmware

Supreme Custom ROM Firmware for Galaxy S3 GT I9305 smartphone has now arrived in style as it comes with a hell lot of modifications and enhancements which we will be checking out in the due course of this article. The best part of this firmware is that it comes with add on apps and also is rock stable custom ROM firmware. For applying this update, you will have to make sure that your phone is rooted. Please note that you will have to make sure that your device is I9305 model only and not the I9300 model of device. We have summed up the detailed features along with the screen captures on how this firmware looks like. Please note that this is not the Official firmware released by Samsung Electronics and is a custom ROM firmware. We are thankful to recognized XDA developer leamoor for coming up with this custom ROM firmware. Very soon there will be an all new firmware version be rolling out for Galaxy S3 I9305 which is dubbed as Jellybean 4.2. This firmware is based on the XXALJ7 build.

LTE 1 LTE 2 LTE 3

Features of Supreme Custom ROM Firmware:
based on jelly bean i9305 XXALJ7
Deodexed & Zipaligened
Rooted with superSu & binary
init.d support
Busybox,bash & nano
Sysrw & Sysro binaries
Improved ram management
Enhanced I/O performance
EXT4 file system tuneups
Faster application loading times

Quick Pre Requisites:

  • It’s mandatory that you backup all your data present in your device with the help of below mentioned steps as there is a probability that the data in your device might get erased or deleted. Don;t backupthe data with the help of KIES as it may not detect the device in the custom ROM firmware.

Disclaimer: Follow all the instructions mentioned in this article as if there is any damage caused due to not following instructions then we shall not be held liable or responsible. Just in case if you face any issues then we will try our level best to address the same.

  • For applying this update you need to ensure that your phone is rooted. To check on whether the firmware is rooted or not, you will have to check the same from the application called “Root Checker”. Download the Root Checker app from the Google PLAY Store and check with the same.
  • From the path “Settings > Applications > Development > USB debugging”, enable the USB Debugging, ensure that the USB debugging option is ticked. Minimum battery life should be at least 30% so as to make sure that it doesn’t get turned off in the middle of firmware update.

So assuming that you are done with all the above mentioned things, you can now head over to the next page where we have summed up a detailed guide on how to apply this firmware update.

About Pradeep Neela

Friends call him Droid Geek because he tries out different ROM’s everyday and helps droid users experience better features on their devices. Add +Neal Pradeep on Google Plus for more Updates.