Previously, the Samsung Galaxy S3 featured an Android 4.0.4 Ice Scream Sandwich fresh out of the box. However, an official Android 4.3 Jelly Bean was released for update but now users can also enjoy the functionality that comes with Android 5.1.1 Lollipop, thanks to a Dirty Unicorn firmware. This newly-launched Dirty Unicorn firmware is specifically for Galaxy S3 users update.To qualify for this update, your smartphone model must be GT-19300 or the 3G model of the 2012 flagship smartphone. The phone device must be rooted and an 80 percent phone power should adequate for Dirty Unicorn ROM installation without interruptions.

Here is how to install the Android 5.1.1 Lollipop onto your Galaxy S3

First you need to download the Dirty Unicorn Android 5.1.1 custom ROM and Google Apps zip package on your PC, then using a USB cable connect your S3 to your computer. Copy the both the zip files and the custom ROM to your phone’s microSD card.Disconnect your Galaxy S3 and boot it to Recovery Mode. Simply press the S3’s Home, Power and Volume Up buttons simultaneously to do this.Once your device is booted to Recovery mode, back up your phone’s data then delete all the smartphone data through the ‘factory reset or wipe data or wipe cache partition’ option.Start the installation process by choosing the “install zip from sdcard” for the Dirty Unicorn Android 5.1.1 custom ROM zip file. Once, installed, choose the “install zip from sdcard” to select the GApps zip file. When the installation process is done, reboot the Samsung Galaxy S3 device and start experiencing Android 5.1.1.Lollipop features.

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What's my model number?

There are several ways to locate your model number:

Option 1
On your device, go to Settings, then "About device" and scroll down to "Model number"
Option 2
Often times you can view the model number inside the device, by removing the battery
Option 3
Using Samsung's model/serial number location tool

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