here's CM 11
The Device must be unlocked and equipped with a Recovery,
you need a ROM.zip and optional GAPPS,the Download Links will you find here.
At first,make a Nandroid-Backup of your existing system!
When you first time flash the ROM or you changed from another ROM-Base,
do a Full Wipe via Recovery,flash the ROM, and then the GAPPS.
Restart to System,configure and enjoy CM11.