not sure if there is a particular reason you are using BT2, but I did a quick Google search and saw people were able to use the Edimax EW-7318USg with BT4 with no problems. There were also a few that got it to work in BT3.
If you can't find an answer to getting it to work in BT2 i would use BT4 as there are better drivers for a wider range of devices, not to mention a newer kernel etc...



