It looks like a card from r4-pro.com
https://web.archive.org/web/20100126031926/http://www.r4-pro.com/index_en.html
I think it was blocked on DSi version 1.4.3 but they released an update at http://www.r4-pro.com/r4-pro_downloads/fwupdate_for_DSi_V1.4.3_PRO.rar, I can't find the file though.
The...