stock bootloader sprint s3 topic

ok i worked on this phone for a few months got fed up and gave up for a few now im back lol.i have a s3 that bricked after a ota update before 4.4 updates to the s3.i have done everything that was on this site.i cant dl anything to it from odin. i have done pit files and all.my question is what file do i put in the bootloader box in odin????? thats about the only thing i have'nt done because i cant seem to find out if its just a boot loader file are a whole kernel.btw the whole issue is when it took the update it lost recovery but it wont let me dl a recovery...any help in making this work would make my hair grow back because im one of those people who wont throw this phone out till i figure it out lol