In order for the Acekard 2i to work on a DSi or DSi XL with FirmWare version 1.4, you need to update the Acekard's internal firmware. This can only be done using a DS Phat/ DS Lite or a DSi with FirmWare version =< 1.3. All new DSi's or DSi XL's will come with FW1.4 preinstalled, so if you don't have access to a DS Phat/ DS Lite or a DSi with FirmWare =< 1.3 you *must* purchase your AK2i from a retailer such as 0ShippingZone or LeetMod who will update the cart to 1.4 before shipping. Even if you intend to use your AK2i with a DS Lite, you should still update the firmware incase your DSL breaks and you later replace it with a DSi. After updating the Acekard will appear in the DSi menu as Danny Phantom, on the DS Phat/ DS Lite it will still appear as Acekard.