Change serialized array size

Hi, i have a problem with my serializable class.
The array “usable” was a 13 elements array in the past, now I’ve changed its size to 14. But i’m unable to play the game, because in the saved data the array has the size of 13 elements. If I delete the player data on my PC it works, but in android I can’t do that on all the users phones! Please help me.

If you are just populating this field at run-time, then I would mark it with System.NonSerializedAttribute or similar. If you do in fact have actual data saved in this field in assets, you could copy and resize this field in OnEnable () or ISerializationCallbackReceiver.OnAfterDeserialize (), though the better option would be to write some kind of editor script that updates all of your prefabs offline.