LG KF350 hard resetSelect Menu > Settings > Reset settings - Select this to reset your phone to its default configuration. You are requested to
enter the security code.
NOTE : Security code
The security code protects the unauthorized use of your phone.
The default security code is set to ‘0000’ and the security code is required to delete all phone
entries and to activate the Reset settings menu. Also, the security code is required to enable or
disable the phone lock function to prevent unauthorized use of the phone. The security code default
setting can be modified from the Security > Change codes.
If your LG KF350 frozen, take out battery and reinsert it.
You can use LG Mobile Support tool to repair some LG cell phone model, after download select menu Customer Support > Recovery Phone
If you know LG KF350 hard reset with buttons / keys pls leave comment.