As usual, need rooted phone..(How to root? - CLICK HERE)
DOWNLOAD - JELLYBLASTV3.0.3_Ported_For_S5830I.zip
1) Place the above file to your sd card (NOT IN ANY FOLDER!!!)
2) Switch off your phone.
3) Go to Clockwork mode. - HOW?
4) Use the volume keys to move up and down, home key to select.
5) Select wipe data/reset and wipe cache, go to advance, wipe Dalvik cache.
6) Now choose "Install zip from sd card".
7) Choose JELLYBLASTV3.0.3_Ported_For_S5830I.zip..
8) Choose "yes"
9) It will be Installed. Now reboot your phone. First boot will take time. Sabar je...
10) If you have followed EVERYTHING above carefully, you will soon boot up to your new rom.
11) Please wait until media scanning is completed.
SCREENSHOT ( MY ACE ) :