[Disclaimer: I'm a noob when it comes to rooting phones.] My brother gave me a rooted device, and with his help, I was able to get it unrooted. After I unrooted it, the wifi has not been able to turn on. When I go into the wifi settings, and slide the button to the right to turn it on, it turns back off instantly. I've been searching around online and I haven't been able to figure out how to fix this issue. I've tried normal ways of solving it, like factory resetting or turning it on in safe mode, etc, but I don't dare mess with roots, unless there is someone that can help guide me. Does anybody have an idea on how to fix this, and would be willing to help me? 
Thanks!
Thanks!
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