If you are interested to try the LineageOS 14.1 on your Galaxy S4 I9505 (code-named jfltexx) and Verizon Galaxy S4 (jfltevzw), check out the below installation guide. Before start note that the status of the ROM is nightly, which means the ROM is unstable and includes bugs. If you are ready to face few issues, head over to the installation instruction.

LineageOS 14.1 (Android 7.1.1 Nougat) brings various new features to enhance user experience. You will get multi-window mode, enhanced notification system, data saver mode, night mode, one-handed mode, better battery life, latest security patches and more on your Galaxy S4. For installing LineageOS 14.1, your Galaxy S4 should be rooted and have installed latest version of TWRP custom recovery (3+). Important Note: As always, backup any important file stored on your device before flashing the ROM. Also, do not forget to make Nandroid backup from custom recovery.

How to Install LineageOS 14.1 (Android 7.1.1) on Galaxy S4

  1. Download LineageOS 14.1 ROMM zip for Galaxy S4 (Intl) from here (jfltexx) and for Verizon Wireless Galaxy S4 from here (jfltevzw). Also download Android 7.1 compatible Gapps zip file from here.
  2. Transfer both zip files (ROM and Gapps) to your phone’s SD card.
  3. Switch off Galaxy S4 and boot it into TWRP recovery mode by pressing and holding the Volume Up + Home + Power buttons at the same time.
  4. In TWRP recovery, select ‘Wipe’ > Advanced > and clear cache, data and factory reset.
  5. Then, select ‘Install’ and navigate to LineageOS ROM zip file and swipe right to flash. Repeat the same for flashing Gapps zip file.
  6. Return to main recovery menu, select ‘Wipe’ and clear cache and data.
  7. Finally, reboot your Galaxy S4. It will take 10 – 30 seconds for the first boot. Once booted up, set up and Enjoy Android 7.1.1 Nougat. Keep in mind that, LineageOS 14.1 is still in works, so you will find many features missing in this build. Leave your views in the comment section below (Source)