How to upgrade from 5.0 to 5.1.1?

I'm looking for a guide for how to upgrade from a rooted 5.0 based rom to 5.1.1 rom and still have root. I know I need to update the modem and bootloader but I am not sure of the steps.

from xda-developers http://ift.tt/1Y21c4g
via IFTTT