Install Android 5.1.1 CyanideL ROM on AT&T Galaxy S3 I747

Samsung Galaxy S3 barely received the update of Android 4.4 Kit-Kat, the reason was the Galaxy S3 was showing a lot of lag on Jelly Bean, even with the 1GB of RAM and while testing Kit-Kat on it, made it pretty smooth. Now that was only for the international version, for carrier bounded variants, even the Kit-Kat update wasn’t available, let alone with Lollipop, which in simple terms, quite impossible to be released for such old Flagships. But then again, we have the Custom world of Android who is keeping all the old devices alive and fresh and in our case it is the AT&T Galaxy S3 I747.

The CyanideL Custom ROM is based on the Android 5.1.1 Lollipop and runs on the AOSP and Pure Android sources. Such ROMs are made specifically for the Performance and smoothness, not to mention a good battery life too. If you are still running the Kit-Kat based ROMs on your device or the Jelly Bean based, then I believe it is time to move on. In this article, we will show you How to Install Android 5.1.1 CyanideL ROM on AT&T Galaxy S3 I747. If you are interested in Other ROMs, you can Visit our Custom ROMs section or you can install this ROM on your AT&T Galaxy S3 I747 by following our tutorial below. This is not an official release from Samsung but a Custom ROM. Installation procedure uses the Fastboot commands to install this custom ROM. Your device must be rooted. Let’s go through the early preparations and then flash this ROM.

Install Android 5.1.1 CyanideL ROM on AT&T Galaxy S3 I747

Early Preparations:


The methods involved in flashing custom recoveries, roms and rooting your phone are highly custom and may result in bricking your device, and has nothing to do with Google or the device manufacturer that is Samsung in our case. Also rooting your device will void its warranty and you will be no longer eligible for any kind of free device services by the manufacturers/warranty providers. In case of any mishap we may not be held responsible. Follow these instructions to the letter to avoid any mishap or bricking. Make sure that whatever you do, you are doing it at your own responsibility.

Downloads Required:

Android 5.1.1 CyanideL ROM: Link

Gapps: Link | Mirror

How to Install CyanideL ROM:

  • Connect your device with PC.
  • Copy and Paste the Above zip files to the root of your sdcard.
  • Open Recovery mode. How?
  1. Connect your device with PC
  2. Open Command Prompt in Fastboot folder.
  3. Now Type: adb reboot bootloader
  4. Choose Recovery from Bootloader

CWM/PhilZ Touch Recovery:

  1. Back-up your ROM using the Recovery.
  2. To Perform a Back-up, Navigate to Back-up and Restore on Next screen, Choose Back-up again.
  3. Go back to Main Screen after the Back-up is complete.
  4. Then Navigate to ‘advance’ and choose ‘Dalvik Wipe Cache’, so you won’t get in any bootloop.
  5. Navigate to ‘Install zip from sd card’ another windows will open in front of you.
  6. Finally Select “Wipe Data/Factory Reset”
  7. Select ‘choose zip from sd card’ from the Options.
  8. Select the CyanideL file and confirm the installation on next screen.
  9. Go Back and Flash
  10. Once the Installation is Over, Select +++++Go Back+++++
  11. Select Reboot Now to Reboot the System.

TWRP Users.

  1. Tap On Back-Up and Select System and Data
  2. Swipe the Confirmation Slider
  3. Tap on Wipe Button and Select Cache, System, Data.
  4. Swipe the Confirmation Slider.
  5. Go back to Main Menu and Tap Install Button.
  6. Locate the CyanideL, and Swipe the Slider To install it.
  7. Once the Installation is Over, you will be promoted to Reboot System Now
  8. Select Reboot Now to Reboot the System.

The First boot might take up-to 5 minutes, so please be patient.

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