You need to:
1. open registry in editor [anyone will do]
3. Find value: "SupportFrontCamera = 0" & change to 1
4. Run your camera, go to mode icon, choose self portrait.
This also enables self portait mode in movies recording section, yet the picture is pretty scrambled.
I guess there is a problem with frames support [or whatever] with the front camera and that's why samsung decided to disable it for users.
Have fun [;