Rom Nexsus v6.1 Nightly os 4,4,3 for Lenovo S920 Base CN
from forum.pittech.net, Install via CWM or TWRP
1. wipe data/factory reset
2. wipe cache partition, mouns and storage
3. format/cache
4. format/data
5. format/system, go back, advanced
6. wipe dalvik cache, go back
7. install zip