I can't open my Lg k7 because I forgot my passcode, but i remembered my backup pin code. How do I enter my backup pin on the phone without doing a factory reset?
There's usually one password or one PIN to get into the phone - no "backup PIN". And no way of defeating the password. (It wouldn't be very secure if there were, would it?)
In the future, write the password down and stick it in a sock drawer or something.