un lock keyboard for an LG optimus 6

If it was an official update sent to the phone by your carrier, take the phone to the carrier. The update may be faulty, and it would be their responsibility to fix what they broke.

If it's an update you installed yourself, it depends on whether it was an official LG update you obtained from LG (in which case, contact LG) or one someone else supplied, in which case you're basically on your own.