I think it is offical samsung code. In .rar file is also offical release note .txt . I accept risk if printer will be unusable after FW upgrade. It is 6 years old and I get it for free, in the authorized service center they want 90€ for FW upgrade. So I will try to update it myself and if it will work OK, if not I will thrown it away.
I am looking for that program, it was on orginal CD disk with printer which I do not have it.http://www.overclockersonline.net/images/articles/samsung/scx-4720f/settings_screen4.JPG