46 issue

Hi to all, i have a s7 edge sm g935f, non rooted device, with latest stock frimaware PH6
My problem is that dont have 4g network, a lot of my friends have s7 edge same like me, but they dont have this problem
I tryed a lot of roms with odin, change csc, modems, but no luck, and i know what am doing
Also in Telenor Serbia they told me we dont know why you dont have 4g, a lot of people have this problem
I searched in sammobile to find stock frimaware from telenor Serbia but dont find it,
I am now with Vip Serbia latest frimware PH6,
Someone tell me to root my device and u will have 4g signal
Any one can help me
Thanks

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