Board Thread:News and Announcements/@comment-24264457-20180925194341/@comment-26573805-20181221182951

Then you need to try hex editing and see if you can map and sort out the flags yourself to add this content to your save file, since it's all on-disc already. Or find the right person, like how me and GetLuck have privately exchanged save data for some of the unlockable songs for instance.