Although a 3-year-old device, Samsung Galaxy Note 3 owners can still enjoy the latest and sweetest Android 7.1 Nougat on it. Currently running on the Android 5.0 Lollipop, the Galaxy Note 3 gets Android 7.1.1 Nougat via unofficial CyanogenMod 14.1 build. Though still in developing stage, there were no major bugs in this ROM. Major components of the phone (Wi-Fi, RIL, Calling, Camera, Cell data, etc.) are fully functional. Interested users check out the installation guide.
Thanks to the great developer community, the unofficial CM14.1 can be installed on your Note 3 via custom TWRP recovery and experience the latest Android Nougat. If your Note 3 (SM-N9005) is running on Android 5.0 Lollipop, you can flash the CM14.1 on it, but requires latest version of TWRP recovery and root access on the device.
As always, before start backup entire data you have on the device, as the below guide will wipe all data from the device. Also note, make sure you have a stock system image to flash back to. Make a system backup from TWRP recovery before proceeding.
Note: To install unofficial CM14.1 requires Android 4.3 (or higher) bootloader on your Galaxy Note 3.
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.
2. Reboot your Galaxy Note 3 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 Note 3 and enjoy Android 7.1.1 Nougat. Any question? Leave it in the comment section below (source – Trader418)