Default GPS.conf error.

Hi, I have this problem with my GPS.conf, I can't change it.
If I changed it it says that he can't save the file.
If I try it with an Application like; https://play.google.com/store/apps/d...uble.FasterFix OR https://play.google.com/store/apps/d...=org.fastergps
He can't change it.
Don't know what or were the problem is.
I need to change it to nl.pool.ntp.org at this moment how it looks like:
https://www.dropbox.com/s/l6p7unb7t9...2-14-31-47.png

My phone:
https://www.dropbox.com/s/orbvn0hwwg...2-14-33-08.png