LG GD510 Pop hard reset
Enter 1809#*510# dialpad ---> Factory reset (All data will be lost!)or
Settings > Reset settings - Restores all settings to their factory defaults
or reinstall / update firmware /w USB cable
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 GD510 Pop hard reset with buttons / keys pls leave comment.