Stick to M3i Zero or SCDSONEi (I wish I had, as I give myself a facepalm!).
I just received a new AK2i..and it won't update to work on DSi FW 1.4A. Sticks on 0% progress for update. I've tried both update files on 2 DSL & 1 Phat, all to no avail.
Looks like 'they' must be shipping either old stock (initial 2i cart was not updateable?), a dud, or a fake.....who knows - certainly not me.
Oh well, I guess @ $14.46 delivered to Australia in 10 days, it might get a 'run' as a backup for the DSL & Phat.