Incorrect password and unable to join
i got 2 iphone 6s that i bought from a person and he said to me they work fine but they don't connect to wifi nettworks.
So i got them i have DFU restored both of them - SAME PROBLEM
I have changed their wifi anntenas - SAME PROBLEM
I have cleaned their motherboard with alcool - SAME PROBLEM
so i decided to ask you guys if you have any knowlege about this problem i know it's motherboard fault but i'm not good and finding problem by myself.