[ROM] [4.4] CyanogenMod 11 for Google Nexus 5

Instructions:

First time flashing CyanogenMod 11.0 your device, or coming from another ROM?
Download the zip(s).
Optional: adb backup
Fastboot oem unlock > fastboot flash recovery recovery.img.
Perform a NANDroid backup of your current ROM.
Wipe data & cache partitions of your device (required when coming from stock!).
Flash CyanogenMod.
Optional: Install the Google Apps addon package.



Downloads

Latest build: http://download.cyanogenmod.org/?device=hammerhead

Google Apps: http://wiki.cyanogenmod.org/w/Gapps


Changelog
A rough changelog is available here:
http://www.cmxlog.com/11/hammerhead/ or http://changelog.bbqdroid.org/#/hammerhead/next


source : http://forum.xda-developers.com/showthread.php?t=2584004