You need to have stock recovery and no system changes for OTA to work.

---------- Post added at 08:17 AM ---------- Previous post was at 08:17 AM ----------

Easiest just to flash 4.4.4 with fast boot.
Sent from my new HTC One M8, N7, Moto X, GTab3 or S2.

Need help with poor battery life? Any device welcome, even tho its an N5 thread. Please specify if on a device other than N5. Lots of info in first 4 posts! >>>>
[Battery Life Help] Troubleshoot Battery Issues Here....and Tips