WOJPen: I tryied your method....but failed.
In my DATA.ZIP/UI_igo9/800_480/loading.bmp and DATA.ZIP/UI_igo9/800_480/skin_night/loading.bmp
(originals, in use)....both files are 348kb (not the 1.09MB)!!
I replaced them with my custom files 1.09MB....and fail/error/message