So, somehow, I managed to pick up one of these phones. I definitely want to be able to run a Marshmallow based ROM on it, because it is supposed to enable full Band 12 for T-Mobile. That said, it came out of the box with 5.1.1 already. So, naturally I want to root. But I currently don't know whether I should root now while it's still on Kit Kat, or update and root later? Which would be better to do at this point?