Install GApps (optionally) [Recommended -> Open GApps (arm) (5.1)] ... [ROM] [7.1.1] [NOUGAT] CyanogenMod 14.1 for Nexus 5 [CAF] ... How to Install CyanogenMod 12. CyanogenMod is a custom ROM for Android devices. It's free, and it ... Step 1: Download CyanogenMod Installer.