It is bad form to attempt to write to the provided libraries as upgrading KiCad will wipe out your changes to the provided libraries. You should create and manage your own libraries for your own assets. See this FAQ entry for suggestions:
It is bad form to attempt to write to the provided libraries as upgrading KiCad will wipe out your changes to the provided libraries. You should create and manage your own libraries for your own assets. See this FAQ entry for suggestions: