You can get the chinese firmware here (2006/10/20 post):
http://www3.emu-zone.org/host/ediy/emu-hw/diy/dslink05.htm
I used this one and it worked fine on my DS Link. I don't know why they didn't have a universal firmware....I didn't realize my DS Link was the chinese version when I bought it...
Is anyone familiar with former forum opg.life ? I missed the transition to the new forum over the week end (was scuba diving in the sticks with no internet connection). If anyone in touch with any members please pm me.