Besides these, there are a lot of changes and performance tweaks that will keep will improve your user experience with the Galaxy S4. You can follow these steps to install Halcyon Android 5.1.1 Lollipop custom ROM. Firstly, you need to download the ROM and Google Apps zip file to your PC and connect your phone via USB.
Place both of these files in your phones root folder in the SD card. The device should be rooted and must have ClockworkMod Recovery/TWRP tool installed. After this, turn it off and disconnect from PC. After this, enter Recovery Mode and clear phone memory.
Now, head over to ClockworkMod recovery, and select ‘advanced’ and tap ‘wipe dalvik cache’. Now, choose the ‘install zip from SD card’ option after coming back to the main screen. Do the same for Google Apps installation.
After this restart the device and choose ‘reboot system now’. Halcyon Android 5.1.1 Lollipop custom ROM is now ready for use.
Stay tuned for more updates on Samsung Galaxy S4!