Hi im having the same problem: wi fi option to turn on is greyed out and wont turn on. I have tried turning phone on and off a few times, taking battery out for 5 mins taking sim out. I have tried starting in safe mode, i have tried clearing my system cache, I have turned off power saving mode I have cleared memory and finally I have just performed a factory reset and still no luck. Is there anything else I can do? Its a samsung Galaxy s5 neo sm-G903f android 6.0.1 software is apparently all up to date etc Help!!
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