LG F9200 - Manual (Page 78)

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Settings
Reset Network profile (Menu 9.6.3)
This allows Profile information to be restored to
original setting. For example, this option will restore
the Profile that has been deleted by the Delete All
selection from the Access Point (Menu 5.4) submenu.
Reset Default Menu 9.7
You can easily reset your phone to its default
configuration. To do so, proceed, as follows.
1. Select the Reset Settings menu option.
2. Enter the 4-digit phone password.
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Note The password is preset to 0000.