Samsung Galaxy S3 I9300 is an old device now and most probably will not receive any future updates officially, but thanks to the third party developers who are continuously working to make the most out your Android device. The good news is, now you can update your Samsung Galaxy S3 GT I9300 to Android 5.1.1 Lollipop via Euphoria OS Custom ROM. The Euphoria OS Custom ROM is based on the AOSP (Android Open Source Project) and this custom ROM has some major performance improvements and customization tweaks.

If you are a Galaxy S3 user and want to taste the performance of Lollipop on your Galaxy S3 then this ROM is definitely for you. Installing this ROM is pretty easy all you need to do is to follow the steps below on how you can install the Euphoria OS custom ROM on your device. But before proceeding, let me remind our readers that this ROM is a custom ROM made by third party developers and has no link with Samsung.


  • Before proceeding, make sure you have properly taken the backup of your important data including personal photos and videos.
  • Your device should have more than 60 percent battery to prevent any unexpected shutdowns during the process.
  • You have installed the  Samsung Galaxy S3 USB drivers on your PC.
  • Your device must be rooted and have Custom Recovery like CWM installed.
  • You should have enabled the USB debugging mode. If you not then go to settings > Developer Options and enable it.
  • This guide is only for Samsung Galaxy S3 I9300. Don’t try it on other variants.

How to Install Euphoria OS Android 5.1.1 Lollipop Custom ROM on Samsung Galaxy S3

Step No 1: First, you need to download the Euphoria OS Android 5.1.1 Lollipop custom ROM and Gapps on your PC.

Step No.2: Copy the files and place it in the root directory of your SD Card.

Step No.3: Now, turn off your device and boot into recovery mode. Turn the device ON while pressing and holding Power + Home + Volume Up keys at the same time till the TWRP logo appears. Navigate to the recovery screen and select Backup.

Step No.4: After backup is finished. Perform Wipe of Data, Dalvik Cache and System.

Step No.5: When completed. Go back to the main menu of the recovery and select install. Now navigate to the root directory and select the ROM you have downloaded in the first step and tap swipe to Confirm Flash option

Step No.6: Once installation is compeleted, again perform a Wipe Dalvik cache.

Step No.7:Now, go the main screen of the recovery and select Reboot.

Step No.8; Apply the same above steps for installing the Gapps.

Step No.9: Now restart the device and it’s done.

That’s it. Your Samsung Galaxy S3 GT I9300 has been updated to Android 5.1.1 Lollipop. If you have any questions let us know in the comments.




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