Wifi wont work in Samsung galaxy 3 even after a hard reset I have a samsung galaxy s3 which was in excellent condition when I sold it.  After 2 weeks, the buyer wanted a return, so, I got the phone back. Somehow, the wifi is not working. When I look at the firmware, it says 4.4.2 which believe is kit kat. It seems to me like he tried to hack it and now the wifi wont work. Plus, who knows which other program he altered? I end up paying him and end up with a phone I can't even use. Please help me. I followed the hard reset and it still wont fix the problem...:(
Android 4.4.2 (Kitkat) was not officially released by Samsung for the Galaxy SIII.
You can search at SamMobile for your SIII (GT-I9300) and download the latest official firmware. (registration required but I can give you the links too, if you don't like to register there)
Then flash it using Odin (or similar) to get your stock firmware back.


  A private sale is free from any warranty by the seller, so you didn't even have to accept the return (in the EU at least).