A Factory Reset should restore it to its pristine state. I got this information from How to Hard-Reset.com
Hard Reset LG Optimus F7 and LG Optimus F7 Factory Settings Method.
Switch the mobile phone LG Optimus F7 off.
At the same time click and hold Volume level Down Key + Power Key .
Launch the keys when the FACTORY HARD RESET display screen shows up.
Understand the notice and click the Power/ Lock Key to verify. Click any other key to end.
Click the Power/Lock Key to verify once more or click any other key to stop.
Your product LG Optimus F7 will execute a hard reset and restart quickly. CauTion If you execute a hard reset, all user apps and user files will be removed. This can
Dial this ##72786# it will reboot and all network specific info will be erased and the phone will be ready for activation. I also suggest you do what the guide above said, so that it deletes all the past data by the last user.
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