Default Modem flash with or without non-hlos?

Hello, normally when changing the modem,
i use one single file what include modem.bin + non-hlos.bin.
Today ive read the non-hlos.bin is a wifi-fix for people with incompatible BL to activate Wi-Fi, is that right? Actually my BL is the NAD, new BL. Which files have to Flash, only Modem.bin or non-hlos.bin, too?
I flashed the NF1 Modem and non-hlos in one file and have problems with mobile Internet. And last, can I flash modem over mobile Odin?
Greetings AbiDez