"Software Update Failed" Samsung galaxy s4 Sch-I545

While trying to downgrade from 5.1 to 4.4.2 using Odin for my Samsung galaxy S4 , the process failed and now whenever i boot my phone it says "Software Update Failed" your device didn't update successfully. use the Verizon software repair assistant on a computer to repair your device and complete the update. Then i looked around and found a way to get Verizon software update and pluged in my phone but the software can't seems to recognize my phone even though the picture showed that the phone is connected to my PC. I tried flashing the stock file for my phone (Sch-i545) but they all failed. Please help me fix this problem, i really need my phone.

Thanks.