Note 4 Verizon N910V 5.1.1. Questions

Does Any one know how to Downgrade from 5.1.1. to 5.0.2 or 4.4.4.?
Does Any one know how to root 5.1.1.?
How to write cert on 5.1.1. with or with out cert?
I am stuck with a Verizon Note 4 5.1.1. what should i do its reported stolen cant register on any network t-mobiles or att.
Any suggestions.
Greatly appreciated.