if you dsi is running on firmware 1.4e you need to down grade the cards firmware as it has firmware preloaded on the card . you have to go to acekard.com for the update files and update the card in a ds or dslite for it to work in your dsi m8
hereyou go m8 uploaded it here for you ak2ifw_update_14_DSi.nds put this file on you sd card nothing else and put into you ds or ds lite and follow in screen intructions once updated clear sd card put acekard2i firmwae on and game and away you go
This was the problem but I had to use my old dslite to load the update as it still would not work in the arckard, one the update was loaded it worked thanks for the heads up