GamerROM brings the Android 5.1 update to AT&T Galaxy S4, and being the based on AOSP-inspired CM12.1, it features stock UI, getting you rid of the ugly TouchWiz UI of Samsung. No doubt, as far as software aesthetics go, Lollipop UI is undisputed king of earth. You also get nice customization options from CM12.1, plus all the new features of Android 5.1 update that was recently launched. The GameROM is also available T-Mobile S4, Verizon S4 and Sprint S4.

You cannot expect AT&T and Samsung to get you an official Android 5.1 update, now that S4 is past two years of guaranteed updates plan. With the launch of Galaxy S6, it’s the S6 and S5 that will get Samsung’s 5.1 updates whenever it comes in next 2-3 months, while Note 4 and 3 are also in line.

But anyway, ROMs like GamerROM, CM12.1, SOKP, etc. will evolve and continue to develop, and your AT&T Galaxy S4 will soon have plenty of choices to install Android 5.1 update from. The small bugs whatsoever will be ironed out over time, and you’ll have a stable ROM soon enough, in a month or two’s time.

Right now, it’s fair to say GamerROM is far from stable, and thus may contain a bug or two that could annoy you a little bit. But, except for video recording that’s still not fixed, everything seems to be working. And it’s not like it’s a buggy ROM, it could very well become your daily driver, but be sure to fully test it before depending on it.

And in any case, if you want to go back to official Samsung firmware for your AT&T Galaxy S4, you can do so pretty easily — a simple firmware flash using Odin software is all it takes to remove custom ROM, custom recovery and root, all in one shot, and restoring the phone back to stock, Samsung firmware.

Note: As you already know, it’s not an official Samsung Android 5.1 update for AT&T Galaxy S4, so expect few kinks at some corners of the ROM that are yet to be fixed by the team. Any major bugs will be reported below.

Bugs
  • Video Recording
Downloads

Download the ROM file in .zip format from the source development page here, where you could also keep a tab on updates for the ROM, and any current issues with the ROM with fixes, if any, available. No need to download the Gapps separately as this ROM contains them already but flashes separately than ROM to be in line with Google’s policies, while saving you some labor work.

Supported devices
  • AT&T Samsung Galaxy S4, model no. SGH-i337
  • Don’t try on any other Galaxy series set or other device of Samsung or any other company
Instructions

Warning: Warranty may be void of your device if you follow the procedures given on this page. You only are responsible for your device. We won’t be liable if any damage occurs to your device and/or its components.

Important Note: Backup important files stored on your device before proceeding with the steps below, so that in case something goes wrong you’ll have backup of all your important files.

  1. Transfer the ROM file package file to your device’s internal storage and remember the location where you save it.
  2. You need TWRP recovery for this. Get it from here. There’s good instructions set there, too. For more help, Google is your friend.
  3. Boot into Recovery mode.
  4. Once in TWRP recovery, take a backup of your current ROM. Select Backup, then do a “Swipe to Back Up” on the bottom of the screen.
  5. Once the backup is finished, select Wipe, then do a “Swipe to Factory Reset” on the bottom of the screen.
  6. Go back to the main menu of TWRP recovery and select Install.
  7. Navigate to the file where you saved your ROM’s zip file, select it and “Swipe to Confirm Flash” on the bottom of the screen. Now wait until the flashing process finishes. It will also flash Gapps after flashing the ROM.
  8. Go to back to recovery’s Main menu, select Reboot » select System.

Your device will now reboot with Android 5.1 update, thanks to GamerROM custom ROM.

In case you need any help over this, let us know. And, you can thank the developer g7755725 for this.

Android 5.1 update is also available on: