Step 4: Now, turn off the device and disconnect from the PC.
Step 5: Then perform the regular Recovery mode sortie by press holding 'volume (up)', 'home' and 'power' buttons.
Step 6: After entering the RECOVERY mode, perform full data wipe, by choosing 'wipe data/factory reset'
[Note: use Volume keys to navigate and power button to select options, while operating under Recovery Mode]
Step 7: Now, clear the cache memory by selecting 'wipe cache partition'
Step 8: Then to go back to ClockworkMod recovery, and select 'advanced' and tap 'wipe dalvik cache' [Note: This step is optional, but many recommend this procedure so that user will not face boot loops or any other errors in the middle of custom ROM installation]
Step 9: Again come back to main recovery screen and then tap 'install zip from SD card'
Step 10: Then tap 'choose zip from sdcard' and go to Android 4.4.2 ROM .zip file in SD card and enter the installation process. [Note: use Volume keys to navigate and power button to select options]
Step 11: Once done with the installation process, navigate to '+++++Go Back+++++' and re-start the device by opting 'reboot system now' seen in the recovery menu.
Now, your device (Samsung Galaxy S4 I9505) will take at least five minutes (only for the first time) to complete the booting process.
Users then head to Settings >> select About phone to confirm the installation of custom firmware Android 4.4.2 KitKat Liscio custom ROM.
source: http://www.ibtimes.co.in/android-4-4-2-kitkat-liscio-custom-rom-now-available-samsung-galaxy-s4-i9505-tutorial-602696