it's the ace3ds+ and it's clones that simply do not operate at all without a sdcard inside. ANY sdcard counts for ntrboot.
there are a lot of clones.
notably, while the actual ace3ds+ CAN be ntrboot flashed 100%, most of the clones cannot.
they have released ver 1.03, which adds a lot more AP fixes.
anyone know how it's ntr-boot support works? is it like the stargate where it just works if the magnet is there?