Use APKPure App
Get [ROOT] Wifi key recovery old version APK for Android
Recoveres your lost wifi key of a wifi network you have been connected to.
REQUIRES ROOT!
NOTE: This application will NOT tell you passwords to networks you have not connected to.
This is not hacking tool!
Quickly find and share your WIFI keys!
With search method to quickly find the WIFI accesspoint passwords you have been connected to once.
Save all your passwords in plain text on your SD card to review or backup.