[Android Central Question]

I tried to root my samsung galaxy s7 smg930f it said on odin that it was succesfull but when i started my phone it said that something went wrong and I needed to do a factory reset and thats what I did but now the wifi switch is grayed out , I cant open my camera and cant use my flashlight .I am not good with phones .

[Rukbat]

Now you need to back up everything, then use Odin to flash new firmware to the phone and, if you insist on rooting, use a rooting app that does it properly. (Better yet, find out exactly what rooting is, what it's for, and how to do it without an app.) Chances are, though, that whatever reason you think you rooted the phone for, you don't need root for, or rooting it won't do what you thought, or was told, it would.

To flash the firmware, see [Samsung] How to flash Stock ROM via ODIN.