hey listen, first u need to format the 2 or 4gb memory to ntfs but keep in mind that some 4gb memory do not work at all. so, 2gb are better even if they can support 4gb. then you need to download the firmware if you dont have a cd. here is the main site " http://r4ds.cn/ " without the quotes. once u finish downloading it just unrar the file with Winrar, then copy all the files and folders to R4 memory. After that, make a folder on the memory and name it games or anything u want. Any games u download put it inside the game folder which you created yurself. Remember formating the memory is more important then anything or it wont work. then insert ur memory on ur ds and it should work.

If any problems email me I can help you.