I didn't seem to modify anything. The phone just crashed one day.
I believe the android version it's on is 4.1.2, rooted, teamwin, flash counter (can't kies)
It hadn't been updated in a long time because my USB flex cable was faulty. I repaired this after the phone bricked and it seems to be functioning properly to charge and send data via odin.
I tried several fixes by flashing alleged stock roms with Odin. This didn't fix the issue or I did something wrong. I searched around a bit on the forums but it is difficult because there is so much information and many broken links. If anyone can help I would really appreciate it.
The ironic part is that my contract just ran out 2 days after it bricked. Sprint's trying to covertly get me to renew
(p.s. I'm currently on a Samsung Epic 4G, gingerbread!! It's quite a downgrade!!)
Also, ideally if the phone can be fixed I would like to have a rooted KitKat, so if the solution involves that no worries. I just want the phone to work really.