What you should do now is to downgrade your AK2i to the older firmware with this game icon | Deep Labyrinth - Digital Bros (DSi v1.4.4 & 3DS 4.0.0-7/4.1.0-8)
this allows the AK2i to instantly bootup as the later releases use extra tricks to bypass the enhanced security of 4.2 and 4.3 that adds a black screen for up to a couple seconds before loading.
Thanks for that, I will download that and try when I get home, it loading faster again would be awesome