SAFETY FIRST- Make sure that u backup all your files, messages ,contacts, etc from your phone....
Download s3650xeij2 firmware from here- http://www.mediafire.com/?ogmzmgzdj5l
Download Multiloader v5.56 from here- http://www.4shared.com/file/TAf-S0eQ/MultiLoader_V556.html
Remove SIM CARD and MEMORY CARD from your mobile.....
Turn off your phone then Press Volume down button, camera button and end key at once.
Now this screen should come up :