Yes, an important, but tragic early 3ds flashcard tale. 72% progress till the end of time. https://web.archive.org/web/20140205090449/http://www.crown3ds.com/
They even had a video of it working with a single game (tom clancy splinter cell I think). But I guess they couldn't make work with anything else.
If you think "soon" is bad, well, I can safely say Crown 3ds has them beat. Of course, maybe crown3ds became sky3ds. We'll never know.
it probably is what Sky3DS is today. unless it used system exploits, I don't know. where's that video?