LG BL40 New Chocolate hard reset
Enter on dial screen: 3845#*40# choose Factory reset from the menu to Format phone. All data will be lost!
or BL40 reset via menu
Settings > Reset settings - Restores all settings to their factory defaults.
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 BL40 New Chocolate hard reset with buttons / keys pls leave comment.