Backup and restore efs on galaxy core topic

Hey guys
I am a newbie here and this is my first post here . I want to backup the efs on my galaxy core before installing the monster rom . I have searched everything on the web but didn't get anything about it.
Please I need help coz without efs backup I cant flash my rom . I have tried the efs pro but my phone wouldn't be detectable on the application.
Thanks :o