(T-Mobile) I was wondering the same thing. With 5.1.1, I rooted with KingRoot & did the SuperSU conversion. The Marshmallow upgrade notification has been on my phone for a few weeks, but I feel a little worried about being able to root after upgrade. Today I tried Flashfire (Chainfire app), which is supposed to upgrade while keeping phone rooted. It doesn't support LG, but I tried anyway. I got an assortment of error messages & don't know enough to understand them. Most likely the app just won't work on the phone. I guess it would have to be done via the unroot—upgrade—try to re-root & hope it works slog...