Install Official Galaxy S3 AT&T CM13 Marshmallow Custom ROM

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    Galaxy S3 AT&T CM13 (cyanogenMod 13) Marshmallow ROM (Device Codename: d2att, i747) goes official on CyanogenMod servers. Official NIGHTLY build are automated builds which makes sure the build is not broken by daily code changes made by developers. NIGHTLY builds are not stable as compared to SNAPSHOT builds and may contain some minor bugs. Here is some brief explanation of the difference between a NIGHTLY and SNAPSHOT.

    Installing custom ROM requires a custom recovery to be installed on your device, which may VOID your warranty and may delete all your data. Before proceeding further you may consider backup your all data or take a NANDROID backup using a recovery. You are the only person doing changes to your phone and I cannot be held responsible for the mistakes done by you. Neither the developer nor we will be held responsible for any disaster that happens to your device.


    Galaxy S3 AT&T d2att i747 CM13 (CyanogenMod 13) MARSHMALLLOW CUSTOM ROM


    Root binary is inbuilt since CyanogenMod 12, so you don’t need a separate SuperSu package to install to gain ROOT access. Here is How to Enable ROOT Access on CM13/CyanogenMod 13


    1. Follow this if you are flashing CyanogenMod 13 for the first time to your S3 AT&T, or coming from another ROM:

      This will delete all your data on your phone. You may consider backing up your phone data or take a nandroid backup. Here is how to take NANDROID backup using TWRP recovery.

      Points to NOTE:
      – Try to avoid restoring apps backup using Titanium Backup. It may break things up.
      – Don’t restore system data using Titanium Backup! It will definitely break the current installation.
      – It is also discouraged to Restoring Apps + Data using Titanium Backup.

      • Make sure you have a TWRP installed on your AT&T Galaxy S3.
        If you don’t have a recovery then download it from the above link and see if the below guide works for you:
        How to Install TWRP on Samsung using Odin for the .tar TWRP file.
      • Download and Copy the GApps and CyanogenMod ROM ZIP to your device.
      • Take a backup using a synchronization application or using Samsung Smart Switch or if you have TWRP installed then you can take a NANDROID backup using the TWRP itself.
      • Boot into Recovery. Make sure to have already flashed a Custom recovery like CWM or TWRP on the phone.
      • Wipe data factory reset, Cache partition, Dalvik Cache and Format the System partition.
        – Here is a guide explaining how to wipe data using TWRP recovery.
      • First flash the CM ROM ZIP from device. Then flash the GApps zip from your device memory.
        – Here is a post explaining how to flash a custom ROM using TWRP recovery.
        Use the same guide to flash the GApps too.
      • Reboot and Enjoy the CyanogenMod 13 Marshmallow ROM on your Galaxy S3 AT&T.
    2. Upgrading from earlier version of CyanogenMod 13.0:

    The first boot may take long time, so don’t panic and be sure that you have enough battery backup. Let the phone reboot and then enjoy the official CyanogenMod 13 Marshmallow ROM on Galaxy S3 AT&T.

    After this CM13 installation you may want to enable ROOT access on your phone and here is how you can do that:
    How to Enable ROOT Access on CM13/CyanogenMod 13.

    ? Google Camera APK | LineageOS


    I recently loaded this rom on my S III AT&T phone that was already unlocked and using a T-mobile SIM card, I updated in hopes of boosting the phone’s life being that I had Icecream sandwich still and was not able to use most apps anymore. Anyways I successfully installed marshmallow and it works great except for the SIM card not registering. :(

    I was wondering if there is any fix?


    Don Kiko

    I got the same phone and had the sim error a couple times…
    Problem was the card itself…
    So just take it out wipe the chip (toilet paper!!) thats where I was and what I used at the time xD
    then I used one of those air-pressurized cans to just blow any dust from the contacts…
    put the sim back..battery..turn it back on and voilá problem solved…

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