G925F modem file problem

Hello friend I have g925f with 6.0.1firmware. I have read the process to repair imei with downgrading modem file from 6.0.1 to 5.1. The problem is that I can’t find the correct modem file for my stock firmware. It’s G925FXXU4DPGW. The phone is already rooted. How can I proceed? Thx.