How to Install Android 5.1.1 Validus Lollipop Custom ROM on AT&T Galaxy S3 I747

AT&T Galaxy S3 I747 devices might not receive an official Android 5.1.1 Lollipop update from the company, so if wish to experience the latest Android OS version on your phone then Validus custom firmware is now available with Android 5.1.1 Lollipop for these devices. This amazing ROM comes with LCD Density Changer, DarkUI, CM12 Theme Engine and much more. Many users have installed and tested this ROM, they found it bug free, stable and fast. If you would like to install Validus Android 5.1.1 Lollipop custom firmware on your AT&T Galaxy S3 SGH-I747 then follow the given step-by-step guide.

Remember that this is a custom ROM which is not officially released by Samsung, thus you’ll be required to have a custom recovery like TWRP or CWM recovery in order to install ROM and Gapps zipped files on your Galaxy S3. Ready to get Validus Android 5.1.1 Lollipop on your AT&T Galaxy S3 SGH-I747? Go ahead and the instructions carefully.

Validus Lollipop ROM


The Android 5.1.1 Validus Lollipop Custom ROM and instructions given in this guide are working only with Galaxy S3 model no I747. Check the model number of your device, if it is I747 then go ahead, otherwise not. Do not try to install this firmware on any other device or incorrect variant.


AndroidBlog will not be held responsible for any kind of damage occurred to your Galaxy S3 I747 during or after the installation of Validus Lollipop Custom ROM. Proceed at your own risk.


  • Make a proper backup of all your important data and settings using a custom recovery such as CWM or TWRP.
  • Enable USB Debugging on the Galaxy S3 by navigating to Settings > Developer Options.
  • The battery level of your S3 should be at least about 80% to prevent unexpected shutdowns while flashing the Validus ROM custom ROM.
  • Your device should be rooted and the latest version of a custom recovery must be installed on it.

Required Files:

Steps to Install Android 5.1.1 Lollipop on Galaxy S3 SGH-I747 via Validus Custom ROM:

Follow the given instructions to install Android 5.1.1 Lollipop on Galaxy S3 via Validus Lollipop Custom Firmware:

1:- First, download Android 5.1.1 Validus Custom ROM ( for your Galaxy S3 on the desktop of your PC.

2:- Connect the Galaxy S3 with PC using a USB data cable and copy the downloaded ROM file to the root folder of internal storage of the phone.

3:- Turn OFF the Galaxy S3 to boot into Recovery Mode.

4:- Turn ON while pressing the Power + Home + Volume Up keys at the same time.

6:- While your device is now in CWM Recovery, perform wipe data/factory reset, wipe cache partition and wipe dalvik cache also by navigating to Advanced > Wipe Dalvik Cache.

Note:- wipe dalvik cache will help you to prevent boot loops and other errors while ROM installation.

7:- Go back to the main Recovery Menu and choose install zip from SD card → choose zip from sdcard.

8:- Navigate to the Android 5.1.1 Validus Custom Firmware .zip file which you’ve already transferred to the SD card of your device previously. Select the ROM .zip file using the Power button and confirm the installation to begin.

9:- Next, install Google Apps by repeating the above steps.

10:- Navigate to +++++Go Back+++++ once the installation is completed. From Recovery Menu, reboot your device by selecting reboot system now.

Your Galaxy S3 will be rebooted and may take about 4 to 5 minutes to boot for the first time after installation.

That’s All! You’ve successfully updated Galaxy S3 I747 to Validus Custom Firmware featuring Android Lollipop v5.1.1.

Let us know in the comments area below if you have any query or trouble while installing Validus custom ROM on your Galaxy S3.

Aamir Jamal

An Android Geek and audiophile who love to read and write reviews/tutorials about gadgets and new tech stuff. He has written 1007 guides and other posts.

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  1. Thank you for helping me recover my phone. I had HARD BRICKED it, and had no operating system on it. This enabled me to get my phone back Thankfully. Not so sure I like this version of 5.1.1, but beggars can’t be choosers. At least my phone works again, and if I decide to install a different version, now I can.

    Thank you again.

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