any help will b greatfull
check the bootloader you have and flash the .tar firmware using odin.
get this app called phone info from the market "link"
check the bootloader : MF9, MDL, MK2
after that look for the firmware.tar that matches your bootloader file and flash it using odin, it will wipe your phone clean! once you get the samsung and sprint boot logo you may get stuck on that. since your phone is not longer rooted use the stock recovery " power + Vol up " to clean cache and do a data wipe. and reboot. once the phone boots you can root and start all over.
Perfect thread : link