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.
I have that one and yes it works on both my N3DSs 9.0.
I bought it from RHS but got my gateway from modchipdirect. Order d on a Friday and had it on Tuesday. In fact I need to get another r4, I should do that right now.
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.
"But the precise rating isn't important here, the important question is is it better than my hand and the answer is... BUT FIRST A WORD FROM OUR SPONSORS"