If I happen to have a SD card with what is presumably a dumped update of 9.5.22 (as I updated with it) would I be able to someway revert back to that update? I'm pretty sure this SD card does have that update in question in it, but I'm not entirely sure if I could somehow manipulate my actual 3DS into reverting from its .23U state.
If nothing at all, it's just an idea.