Want to update AT&T Galaxy S3 I747 to Android 4.4.3 Kitkat firmware then you can now do so with the help of Custom ROM. The ROM which we are going to use in this guide is Dirty Unicorn ROM. Dirty Unicorn ROM, originally based on AOKP, but now it is based on OmniROM and brings a combination of Stability and Customization. This ROM packs more features like Customizing the Soft Keys, DSP Equalizer, Smoothness and speed etc. and is based on Android 4.4.3 Kitkat firmware. So if you are interested in this ROM then continue to update AT&T Galaxy S3 to Android 4.4.3 Kitkat update using Dirty Unicorn Custom ROM.
Before proceeding to update AT&T Galaxy S3 to Android 4.4.3 Kitkat firmware, let’s have a quick look at some of the pre requisites to follow to prepare AT&T Galaxy S3 for the installation process and also to avoid it from bricking.
- Make a backup of all of your data to a safe location, as we are going to install the custom ROM which will erase all of your data.
- Charge your AT&T Galaxy S3 to at least 75%, to avoid it from turning off in between the Installation process, if happened it might brick your device and leave it useless.
- Enable USB Debugging on your device from the Developer Options.
- Backup your mobiles EFS data. How? Follow here.
- Root and install Custom Recovery on your device. Link.
Disclaimer: We the members of Gadgets Academy should not be held liable or responsible in any manner for any damage occurred to your AT&T Galaxy S3 for not following the instructions properly. So understand the risk involved and proceed further.
Procedure to update AT&T Galaxy S3 to Android 4.4.3 Kitkat firmware:
1. Download the Android 4.4.3 Kitkat Dirty Unicorn ROM Package and Google Apps Package from here to your PC.
2. Transfer both the files to the Root of your device’s SD card. Power off AT&T Galaxy S3.
3. Enter into Recovery Mode and perform operations to Wipe Cache and Data.
4. Now select “Install Zip from SD card” and choose the Dirty Unicorn ROM package and install it. Follow the same step and this time install the Google Apps Package.
5. After completion of above step, go back and select “reboot system now”.
There you go! You have updated Galaxy S3 successfully.