In case anyone is using an AK2i on Luma,
for my AK2i, I am using the older bootloader that supports 3DS 4.0.0 (Deep Labyrinth - Digital Bros (DSi v1.4.4 & 3DS 4.0.0-7/4.1.0-8))
the reason for this is that the newer ones will boot but they take a few seconds to load as 4.2 and 4.3 had some checks that the cart bypassed with a delay in launching.
the Deep Labyrinth bootloader boots instantly like the GW blue card and the DSTwo.
this bootloader will work launching from the home screen and does not need TWL Slot 1 launcher or stage2 launcher.