Sorry to break to you, but I don't think there's a solution at this point. I was in the same situation last month and there wasn't a solution through xda. I tried, believe me.
Try your best to wipe your phone and remove root status, and then claim LG warranty. The warranty was rejected the first time (as well as unprofessional not-returning-calls to anybody or picking up the phone), but I posted on their Facebook page and got the "executive" team to contact me. Under a week later, I was sent a new/refurbished phone, box and all.
Most stories of LG warranty are terrible though, so best of luck to you. I dealt with LG Canada.