I would like to add that akAIO is just a kernel and boots after the cart has already been booted into, so it doesn't affect the cart's compatibility with the system. I am not very knowledgeable on dsi hacking but according to the guide it says, "Do not system update after installing HiyaCFW. This will remove HiyaCFW’s SD patches.” So I am going to say that updating is a bad idea, but I am not sure what OFW HiyaCFW runs on. Personally, I would suggest going with TWiLight Menu++ for all the features it introduces and still being able to use your AK2i