LG T510 hard reset
To reset your LG T510 phone to factory settings and erase all the data on your phone, touch Menu > Settings> Privacy > Factory data reset > Reset phone.
You can use LG Mobile Support tool to repair your LG cell phone, after download select menu Customer Support > Recovery Phone
If your T510 frozen just take out battery and reinser it, then turn on your phone.
If you know hard reset using buttons pls share in comment.