FLASH CARDS CONFIRMED WORKING IN DSi XL

Picked mine up this morning, while still in the store we opened the package, checked the firmware, was 1.4u, which is the same as it is for the regular DSi. Put in my Acekard 2i with the Danny Phantom patch. Booted right up!
Just thought I would let everyone know if they were curious about it.

Yep.Works fine for me as well.
My AK2i works perfectly on this beast! (I'm on it now. :P).