Whoops! Read the thread incorrectly, i was referring to the DSTWO. BUT, according to that page, it works on all firmware. Nintendo haven't pushed an update blocking DS flashcarts in quite a while though.
Yup. DSTWO is the only flash cart that has not needed multiple hardware revisions to keep 3DS compatibility. They are also really fast at updates when the cart is blocked. Usually within a day
You can't go wrong with that cart.