How to downgrade from Android 6 MM to Android 5 LL for SM-G900V

I have updated my phone on android 6 MM from Sammobile , but I can not root it. Now I want to go down 5 LL Android version , but when I flash the firmware G900VVRU2BPB1 by Odin , the crashes at the Verizon logo . Please guide me how. Thank you . :(