Low effort root on marshmallow?

[pilot constatinus]

How do i low effort root if im on marshmallow, H815?

 

[shadavis08]

Do a quick search it's supposed to be easy on 815 model

 

[pilot constatinus]

Do a quick search it's supposed to be easy on 815 model

I did but i found xda thread and it says you mustnt take an ota and by ota i think they think to marshmallow so is there any way to downgrade?