Just got my AK2i HW 8181 from consolesource too.
My 1.3u DSI see's the cart in the menu. When I try to load it gives me the "error,power off dsi, check manual etc". I tried 4.21/akaio 1.5 firmwares and none of them work. The cart does work with my DSL though fine. I do have a real one...