Just received two acekard 2i from consolesource. My NDSi has firmware version 1.3u and the cart has HW 8181. The Acekard icon DOES show up on the DSi menu. When I click on the icon, I get "an error has occurred. Press and hold the power button... etc". I've loaded the memory card with 4.21 from acecard website and also tried akaio 1.5/1.5.1. Both firmwares give me the same error. Both carts work fine in my NDSLite. My 2gb mSD card is from a retail store and properly formatted in fat32. TIA. Fixed: Just use Dark Knight's link and use that FW to update your card.