nintendo ds r4 card for downloads; im confused!!

[pingu97]

ive just purchased an r4 card for my nintendo ds lite, it came with a micro sd card & flash drive, i have found sites to download from an have attempted to download a game, however when i put the cartridge in my ds ( with the micro sd card inserted in it) a message appears on the top screen which reads; 'couldn't find_DS_MENU>DAT'. I have no idea what this means! I dont know if i maybe need to do something with the sd before it'll work on my ds? or am i just downloading the games wrong? Can someone help me?? Any advice appreciated!

[MrBounty]

You'll need to put on the "operating system" for the R4 card.

Basically, you go here: http://r4ds.cn/
Then read up on what card you have, download the files you need (it'll just be a zipped file, which you unzip onto the root of the SD card), create a folder on the root of the SD card called "games", then put all your ROMS (the games) in there.
Once you switch it all on, you open the games folder and you choose what you want to play.