Starting With Your Last Question, Your GDFS Doesnt Contains Firmware. However Your Firmware Is A Set Of Main+FS. Check The Files You Have For A *.mbn File Which Will Be Your Main And Then A *.fbn File Which Will Be Your FS (Depending Upon Your Region). Then You Need A Custom Pack Which Depend Upon Your FS. Match A Custompack With Your FS Using This Link. Thats All. Follow The GUIDE For Rest.