LG VX8100 hard reset factory reset via menu
Go to menu click the OK button and scroll to the right, to Settings & Tools, then select System > Security. Enter your VX8100 lock code which is your password or your cell phone's last 4 digit. Select reset default click OK, highlight Revert and click OK. Phone will restart itself.
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 VX8100 hard reset with buttons / keys pls leave comment.