Donīt worry about GDFS, because your phone is CID36, you can repair it with service-cable if it needs to.
First flash red erom with XS++ and DCU-60 cable, the normal one which comes with the phone, this should turn your "phone color" to red. You can try to back up GDFS!
Second flash firmware for K750 or W800 CID36 red.
Third finalize (customization).




