Changes made through a editor script on prefab instance are somehow forgotten?

[SOLVED]
Ok, this something strange is happening here.
I wrote a simple editor script to ease with some manual work. Here it is, pretty straight forward.

Code (CSharp):

1. [MenuItem("Tools/Refresh Visuals")]
2.     public static void RefreshVisuals() {
3.         GameObject[] devices = GameObject.FindGameObjectsWithTag("Device");
4.         foreach (GameObject device in devices) {
5.             Transform _ip_text = device.transform.Find("IP Label/Text");
6.             if (_ip_text != null) {
7.                 string ip = device.GetComponent<NetworkDevice>().ip;
8.                 _ip_text.GetComponent<Text>().text = ip;
9.             }
10.         }
11.     }
12.  

It's working absolutely fine except for one problem. Apparently, the script does its work and changes the text of UI labels to what I desire automatically but the changes are not permanent. That is, as soon as I reload the scene and/or restart unity, changes get revert back. Revert back to what you might ask. They get revert back to their prefab value. Yes, all these components are instanced from same prefab reference and apparently unity seems to forget that I made some change in the prefab instance.

I can't seem to find a solution to this and unpacking prefab is obviously not what I want.

 

Found the solution. For anyone stumbling upon the same problem in future :- There is a dedicated method precisely for this problem : PrefabUtility.RecordPrefabInstancePropertyModifications