yea. im pretty sure the firelink is GBA compatable as it has the slot 2 adapter. Thou I cannot tell you how as I onlu use to sell them and I didnt have a DS at the time. I found them to be a pain in the arse as sometimes they would not work on the usb port of some computers. the firelink could be a very good card if they put some time into coding a better program for it.
currently their main website is down so I cant check for you its been down for atleast a month now.
firelink.com(jap), firelink.net(eng)