The ISO should be an exact copy of the game disc so in theory, everything shouldn't be unlocked unless you have a previous save file on your system where everything is unlocked.edit: Sorry, misread your question. You can try downloading a save file that has everything unlocked but the ISO unlikely will have that feature since an ISO is (or should be) an exact copy of the source material.
I can't recall any sites at the moment but I know there are places where you can obtain save files out there.