Default [HELP] Sort of Bricked my GS4

Im new to owning an android, and thought it would be a good idea to root and flash a custom rom onto my Sprint Galaxy s4 sph-l720, Not a good idea. I found some good tutorials to flash the stock rom back onto the phone. I've tried every guide and tutorial there is, but everytime, odin fails. I don't know what i am doing wrong, i may be trying to load the wrong firmware, i am not sure. I was on 4.4.2 Kitkat when i flashed my first custom rom onto my phone, my current custom rom is on 4.4.2, This is very frustrating and at the moment, i do not have a working phone until i can get Odin to stop failing. Thanks for reading. Quick replies would be appreciated!