Cyanogenmod 12 is now available for download for the Nokia X2 android devices. This means users of Nokia X2 will be able to enjoy Android 5.1.1 a k a lollipop on their phones. The progress is still in its infancy stage and not a lot of things are working at the moment. For instance, mobile data, messaging and camera are not yet working on Android 5.1.1 CM12 right now so consider installing it only if Nokia X2 is not your primary device.
Installation instructions for downloading and installing Cyanogenmod 12 Android 5.1.1 for Nokia X2
* Download ROM from here.
* Wipe Factory reset
* Wipe cache
* Wipe dalvik cache
* And flash ROM and GApps
Find the development of this at xda-developers. Again, the status of the android 5.1.1 lollipop firmware for the Nokia X2 is in Alpha phase so there are several rough edges.