Despite being a 4-year-old handset, Samsung Galaxy S3 owners can still enjoy the latest and sweetest Android 7.1 Nougat on it. Thanks to the CyanogenMod developer community, official CM14.1 nightly build (Android 7.1) is now available for Samsung Galaxy S3 i9300 international variant that you can install via custom TWRP recovery and experience the latest Android Nougat.
Interested Galaxy S3 owners may go through the easy installation guide given below to install the official CyanogenMod 14.1 (Android 7.1 Nougat) on Galaxy S3 i9300 (international variant). Note that the present status of CM14.1 for Galaxy S3 is nightly, which means the ROM contain several bugs and lacks many CM specific features. Users need to wait sometimes to get the stable (snapshot) CM14.1 build.
However, if you are ready to face few issues, and then move ahead, flash CM14.1 custom ROM and experience new features of Android 7.1 Nougat on your Galaxy S3. Before you start, make sure you have a stock system image to flash back to. Make a system backup from TWRP recovery before proceeding.
Note: We are assuming that you have already rooted your Galaxy S3 and installed latest version of TWRP recovery (version 3.0…) on it. Also, make a backup of all-important data you have on the phone.
Disclaimer: Please follow this guide at your own risk. Though we are putting our level best to provide this tutorial at its maximum perfection and accuracy, we can’t take responsibility for anything that goes wrong. This guide is intended for technically talented users only.
1. Download CM14.1 ROM zip file for Galaxy S3 i9300 from here. Also, download Android 7.1 compatible Gapps package from here (select ARM and Nano version). Save both zip files on your phone’s SD card.
2. Reboot your Galaxy S3 in to TWRP recovery (switch off the phone, press and hold Volume Up, Home, and Power button few seconds).
3. In TWRP recovery, perform a full wipe (cache, dalvik cache, data/factory reset) by selecting ‘Wipe’ option.
4. Now, flash CM14.1 and Gapps. To do so, select ‘Install’, navigate to ROM zip file and swipe to confirm flash. Repeat the same for Gapps as well.
5. Before rebooting, once again wipe cache partition and data, and then reboot your phone.
Note: The first boot will takes around 10 – 20 minutes. Once booted up, set up your phone and enjoy Android 7.0 Nougat. Any question? Leave it in the comment section below (source – CM)