I had this problem too. I was using the Singapore E988 and when I upgraded it to 4.4.2, the phone could not display the available telco networks in all modes (GSM, WCDMA, LTE...). Either it gives "no network found" or "error while searching for networks."
Tried resetting to factory numerous times and reinstalling 4.4.2, but it doesn't solve the problem.
I had to downgrade it back to 4.1.2 and everything is back to normal.