After he was released on OnePuls One , we were surprised many, since it was released with a version of CyanogenMod 11s , a different version to the other versions of CyanogenMod 11. And thanks to the Android community version of CyanogenMod and was extracted from OnePlus One and cooked to be compatible with the Nexus 5 . This is the version based on Android 4.4.4 which is very stable. Clear the difference between CM11 and CM11S is minimal, some interface changes, camera, gallery, home entertainment and the unlock screen, among other things.
How to install CyanogenMod 11S on your Nexus 5:
Installation is very simple, it is installed through recovery as any Custom Rom, following the steps described below.
1- Have Root and the latest version of TWRP Recovery , if you have not you can install it from following the steps in the next post | Root and Install TWRP Recovery Nexus 5
2- Install the latest version of TWRP Recovery |OpenRecovery-TWRP-126.96.36.199-hammerhead.img
Steps for Proper Installation:
2- Enter Recovery Mode , for it off your Nexus 5 together press the buttons Volume Up + Volume Down + Power, paid into Fastboot mode, and the volume key up or volume down look that says Recovery Mode , and select with Power.
3- Within the Recovery perform a backup (Nandroid) in Backup and Restore (if using CWM) or when using Backup (TWRP)
Followed perform 4- Full wipes, Wipe cache Wipe data, Wipe System
5- Go to Install zip or Install depending on your Recovery and look for the ROM of CyanogenMod_11S_hammerhead_V1.2.zip which was forwarded to the internal memory of your Android and installing it.
6- Finally reboot your Nexus 5 in Reboot system now or Reboot> System
That’s all, with these simple steps’ve installed the Rom of OnePlus One on your Nexus 5 .
Official Thread | XDA Developers