I have the same issue here , the wifi error thing because from what i search i suppose the wifi driver load failure . If you have the same problem don't recklessly do factory reset!!! it can be solved in many ways , if you still got the root access. Now i still find a way how it can be solveable in stock ROM without root access. Any information would be great , need some geeks to help us found out the solution. Because i think it's a side effect from this root method.