My device LG e510 : Android 2.3 had been rooted and then I changed the privileges to view and see some system files, especially for wpa_supplicant.conf, with RootExplorer app.
But unlike most people, I can not see the file inside /data/misc/wifi/ directory, it's empty and /system/etc directory has wpa_supplicant.conf header information file.
Lastly I used WifiPassRecovery app, and the app immediatelly retrieved all the saved wifi passwords.
Where did this app retrieve all those informations? and Why cannot I see the file?