Install Android 5.1.1 Lollipop based Euphoria-OS on Samsung Galaxy S3 GT-I9300


Follow the detailed guide to install Android 5.1.1 Lollipop based Euphoria-OS on Samsung Galaxy S3 GT-I9300. Samsung Galaxy S3 is a ever green device with wonderful specs and powerful hardware, the device is still popular because of its decent specification. Samsung has left software update support for the Galaxy S3 and the device is stuck on Stock Jelly Bean without further updates from Samsung. Now with the release of Android 5.1 Lollipop most of the latest Samsung devices got updated to Android Lollipop and users of Galaxy S3 also wish to update their devices on this latest firmware but they have only one way to choose and that is by flashing custom ROM in their device.

Developers are still working on this device and developed multiple AOSP ROMs based on latest Android 5.1.1 Lollipop Firmware. Good news is now you can install Android 5.1.1 Lollipop based Euphoria-OS in your Samsung Galaxy S3 GT-I9300, the Euphoria-OS ROM contain all the latest feature of Android 5.1.1 Lollipop. All you need to do is just flash this custom ROM in your device via Custom Recovery along Google Apps and enjoy the latest features of Android 5.1.1 Lollipop on your Galaxy S3 GT-I9300.

How to install Android 5.1.1 Lollipop based Euphoria-OS on Galaxy S3 GT-I9300

Before you Begin:

Disclaimer: This tutorial includes multiple operations including Custom Rom, Custom recovery and root. Follow the guide on your own risk, we are not responsible if you brick or damage your device however the chances of bricking a device are rare but you have to pay full attention on the complete guide to avoid any issues and difficulties while performing any of the above mentioned operation.


  • Please ensure your phone battery should be charged at minimum 80%
  • Your device should be rooted and a working CWM recovery must be installed or follow this guide.

Necessary downloads:

Process to install Android 5.1.1 Lollipop based Euphoria-OS on Samsung Galaxy S3 GT-I9300

Turn of your device and boot into CWM custom Recovery menu by the hardware keys combination or using any third party app (Mostly found in Play store).

Once your device enters into CWM recovery, create a Nandroid backup of your device or follow our guide to create a Nandroid backup (this will create a backup of your complete device including current firmware) if something goes wrong you can restore your previous firmware.

Once the Nandroid process completes, navigate and select wipe data/factory reset.(this will erase your data)

Now it’s the time to flash the CM12.1 ROM on your device. Choose “install zip from sdcard” >> choose zip from sdcard & navigate to the folder in which you have copied the custom file and select it.

Select “yes” to confirm install, wait for a few minutes till the file is completely installed in your device.

Once done with the above step, now apply the same process with the installation of Android 5.1.1 Lollipop Gapps.

Wait for the installation process to complete.

That’s it! You have successfully installed Android 5.1.1 Lollipop Euphoria-OS on your Samsung Galaxy S3 GT-I9300 now experience the freedom of a custom firmware on your device. If you have any query feel free to contact us by posting your queries in the below provided comment section. Follow us on Facebook/Twitter/Google+ for future update.

A Software Engineer who loves to hang around latest gadgets and writes his own experiences to get the best possible and accurate information.
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