CyanogenMod was once the king of custom ROMs, and its Android 4.4.4 KitKat build is often considered the most stable and reliable custom ROM available for the Pocket Neo.
The Samsung Galaxy Pocket Neo is a compact and feature-rich smartphone that was released in 2013. With a 3-inch touchscreen display, 2MP camera, and Android 4.1 (Jelly Bean) operating system, it's a great device for those who want a simple and affordable smartphone.
The true masterpiece of the Galaxy Pocket Neo custom ROM world is the arrival of Android 5.0 (Lollipop) and later, Android 6.0 (Marshmallow).
You cannot flash custom zip files using the factory Samsung recovery menu. You must install ClockworkMod (CWM) or Team Win Recovery Project (TWRP) first. Turn off your device.
Unleashing the Past: The Exclusive Samsung Galaxy Pocket Neo Custom ROM Guide
Transfer the custom ROM .zip file and the compatible GApps (Google Apps) package. Tap in the TWRP menu. Select the ROM .zip file and swipe to confirm flashing. Go back and select the GApps .zip file, then flash it.