Galaxy Core 2 G355H is a great phone but Samsung has stopped pumping out updates for it. For XDA is here to rescue as they are have released a custom ROM that is rooted, deodexed and comes with custom boot animation.
The only requirements is Core 2 CWM or TWRP recovery for galaxy core 2 SM-G355H Samsung phone. Here are the installation instructions:
1) download rom from link below and put it in your SD card.
2) reboot into recovery.
3) wipe data and cache from recovery.
4) flash the rom and click reboot system.
Feature list of Galaxy Core 2 Rooted, Deodexed Custom ROM
* custom boot animation
* stock wallpaper changed
* xperia launcher added
* xperia live wallpaper
* htc gallery added
* xperia notes
* xperia calendar
* many useful apps
* deleted useless apps
You will get 1.85 GB available after flashing.