How to fix an LG Optimus stuck in a bootloop after updating while rooted?

[AC Question]

I rooted my phone a while ago and then a new update came out. I was a little concerned that i might mess up my phone so i did some research and what i saw was that if a phone is rooted and you update it, it just gets rid of the root so i updated it and now it wont work. I is stuck at the boot screen and when i try to hard reset it (holding the volume and power button until the factory reset shows up) it starts up like it is resetting ad then it goes back to the boot loop. Ive done a lot of research the past few weeks to find out how to fix it and ive had no luck. so anyone have a way to fix it? Can someone please help me? Thank you