If you have used another GDFS other then the GDFS your phone is dead.

VERY IMPORTANT: Your phone GDFS is unique to your phone. Writing a GDFS from any other phone will permanently damage your phone beyond repair. You must always write a gdfs that came from your very own handset. Lets say you have a w610i and you try to restore a gdfs that came from your friends w610i then your phone is in big trouble. Hence make sure that the GDFS that your writing is your own GDFS.