Here's a procedure on how to hard reset the LG KS20 and restore the deivec back to its original factoty setting.
Note, The result of this process will delete all the third-party application installed and any data stored on the phone, you may need to back up all important data before you may proceed.
To Hard Reset the LG KS20
1. Shut the Device Power OFF.
2. Press and Hold the Volume Down, Call and Power Button simultaneously, then the blinking LED indication appears.
3. Release the Buttons, The LED will blink to blue,red, green and power up.a