Install Android 6.0.1 Marshmallow on Galaxy S3 GT-i9300 via CM13 Nightly


Android 6.0.1 Marshmallow is now available for Galaxy S3 GT-i9300 via Official CyanogenMod 13 Nightly ROM. Samsung has already left firmware update support for this device, Galaxy S3 is an older but still a popular phone and that’s the reason developers are still working on it. Team CyanogenMod is a popular custom ROM developer company and personally I recommend you to try the latest released official Nightly CM13 ROM on your Galaxy S3 GT-i9300. The Official CM13 ROM for Galaxy S3 GT-i9300 is pretty stable and can be used as daily drivers. In this guide we have mentioned the whole procedure to install Official CyanogenMod 13 ROM based on Android 6.0.1 Marshmallow on Galaxy S3 GT-i9300. We are going to follow the same process we have already posted for unofficial CM13 builds, just go ahead and follow the below instructions.

There are multiple benefits of installing custom ROM on your Galaxy S3 GT-i9300 as it provides a wide range of customizations and limitless modifications which unfortunately you can’t find in the stock firmware. Some custom ROMs gives you freedom to overclock CPU, install tweaking mods and tons of other software to enhance device performance further you can install themes to customize the device look. Just go ahead and install the Android 6.0.1 Marshmallow on Galaxy S3 GT-i9300.

Note: The Official CyanogenMod 13 for Galaxy S3 GT-i9300 is a Nightly update so you may experience some minor bugs but most of the features are working work fine. This not an official update from manufacturer but it’s a custom ROM from third party developers so check twice before installing Android 6.0.1 Marshmallow via official CyanogenMod 13 on your Galaxy S3 GT-i9300. You can easily revert back to stock ROM anytime you wish, but we recommend you try the latest Official CM13 ROM on your Galaxy S3 GT-i9300.

Also read:

How to install Android 6.0.1 Marshmallow on Galaxy S3 GT-i9300 via CM13 Nightly

Before you Begin:

Disclaimer: This tutorial includes multiple operations including Custom Rom, custom recovery etc. Follow the guide on your own risk, we are not responsible if you brick or damage your device however the chances of bricking a device are rare but you have to pay full attention on the complete guide to avoid any issues and difficulties while performing any of the above mentioned operation.


  • Please ensure your phone battery should be charged at minimum 80%
  • Download Samsung USB drivers
  • Your device should have a working TWRP or CWM recovery installed or follow this guide

Necessary downloads:

Process to install official CyanogenMod 13 Nightly ROM on Galaxy S3 GT-i9300

Connect your device to your PC and copy the both ROM and Gapps zip files onto your device storage.

Turn of your device and boot into TWRP custom Recovery menu by the hardware keys combination or using any third party app (Mostly found in Play store).

Once your device enters into TWRP recovery, create a Nandroid backup of your device or follow our guide to create a Nandroid backup (this will create a backup of your complete device including current firmware) if something goes wrong you can restore your previous firmware.

Once the Nandroid process completes, tap on “Wipe” and then swipe the slider from left to right to begin the wipe process (This will reset your device to factory)

Now it’s the time to flash the Marshmallow firmware on your device. Choose install and navigate to the folder in which you have copied the CM13 Nightly zip file

Swipe across the slider to confirm install, wait for a few minutes till the file is completely installed in your device.

Once done with the above step, now apply the same process with the installation of Gapps.

Wait for the installation process to complete.

Once completed Reboot your device.

If your device is taking longer then 7-10 minutes then follow this guide to to fix this issue

That’s it! Nightly Official CyanogenMod 13 Android 6.0.1 Marshmallow is successfully installed on Galaxy S3 GT-i9300. If you have any query feel free to contact us by posting your queries in the below provided comment section. Follow us on Facebook/Twitter/Google+ for future update.

A Software Engineer who loves to hang around latest gadgets and writes his own experiences to get the best possible and accurate information.
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