Can't access efs files at all from cm

When I try to access my /efs/ folder my phone immediately reboots. When I try to extract efs1.emmc.win from my backups, nothing is extracted. Is my efs corrupt? I'm on CM 13 for N910H, and I'm trying to switch to stock ROM by copying my nv_data files over to my stock /efs/ if I can actually access /efs/ through a file manager on my phone.
someone help

from xda-developers http://ift.tt/2bziQOu
via IFTTT