I bought the iPlayer Video/audio player card for the DS, It accepts a microSD card. I just solved my problem. I will explain it in case I am not the only moron in the world. The root directory of the microDS card should have the folder named "_system" . I had copied the contents of the -system folder to the microDS card in the root directory, not the _system folder itself. What is the best forum to post in, when I have an intelligent question? I downloaded the latest iPlayer OS, unzipped it, and copied it to the microDS, then inserted the microDS into the iPlayer card, then inserted the iPlayer card into a DSi, the powered up the DSi. The iPlayer logo/button was visible. I selected the iPlayer logo/button. An error message apeared on the top screen. NO FIND SYSTEM FILES What exactly is supposed to be in the root directory of the microDS card? Which files? Are the subfolders supposed to be on the card as well? I tried this with a DS lite as well. It crashed, telling me I had to power down.