Bell/Virgin i747m to nj1 question

Hey, I'd like to use CM12.1 official nightlies but I have a bell(well, virgin) phone with the ne6 bootloader and I'd like to be able to upgrade to nj1 but I've searched and no one has written anything about it, only the American version. Can anyone please explain clearly how I go from NE6 to NJ1 to get my phone or equivalent to run CM12.1? :(