should be
http://www.r4isdhc.com.cn/download.asp it's still active the site, which of the pics come's closest if you disregard the year on it? that's the package you'll need to download both the update fw and the kernel.
update should be when extracted with
7zip a .NDS file, and kernel should be when extracted with
7zip multiple files and maps.
format the micro-sd card in fat16 or maybe fat32 will do fine.
copy the extracted contend to the root of this micro card using a cardreader.
if still not working, it might meen you'll have to find a friend with a DS or DSlite NOT A DSI or 3DS (this because you'll need to update the firmware and the only safe install would be by doing this on the non network version of DS).
start the DS with this card in it, now it will boot directly without the error.
start the fw update file now, probabbly this will take some time so make sure the DS is charged fully, or hanging on a charger.
when complete, restart the DS with the card.
now try the card in your own DS to see it's working.