original discussion (in italian):
http://www.androidiani.com/forum/zte-nubia-z7/472442-rom-z7max-android-5-1-1-cm-12-1-unofficial.html
Hi all, after a long time I came back with a new rom 
it is a (multilanguage) CM12.1 entirely compiled by me, still it as some problems but is already usable
what's working:
camera
flash led/torch
gps
wifi
dual sim
sensors
nfc (maybe)
Bluetooth
led notification/charger
what's not working:
FM radio
Infrared
(maybe other)
not implemented yet:
Double tap 2 wake
changelog:
06/07/2015 alpha2
first public release
ONLY FOR MERGED PARTITION
flash instruction:
first of all: backup all with twrp recovery
download rom and gapps
full wipe
flash rom and gapps
reboot
The first boot takes a bit 'of time
Root access can be enabled in developers options