You went to edge-ds.cn, right? I can't link it directly because it seems that if the site has a referrer at all then you can't use it.
The site works fine for me, but if you cannot for the life of you get the site to work, the DSerial EDGE is based off the EDGE, so http://natrium42.com/wiki/Downloads. Remember that at the time of writing, this version is not the most bleeding-edge version of the EDGE OS.
EDIT: You're better off looking around GBATemp, I think, since they have the newest version right now. It's under "Other Flashcarts & Adapters." Go nuts.
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