Jailbreak iOS7.1.2 must download this:
1. For Windows For Mac
2. Change Time & Date On iPhone to Jun/02
3. Click Jailbreak
4. Click Pangu on iPhone
5. Wait iPhone Restart do not unplug iDevice
Download this software:
1.Dumpper
2.jumpstart
3.Winpcap
4.Microsoft.Net Framework
Just Run Dumpper and ->WPS->Check box to show Pin wps->Click Button Jumpstart.
After that you finished and get password Wifi automatic.Thanks you.