Hi
Check software requirements and configuration requirements in the attached guide.
I think it gives you your answer (I hope )
It suggests you need 1.0.3 software and then try the following;
Manually Configuring the 100M SFP
STEP 1 On the Port Configuration page, click Detail.
STEP 2 In the Port Configuration popup window, select eth 100M in the SFP Speed field.
STEP 3 Save your changes.
STEP 4 Insert the 100M SFP module.
Hope this helps
regards Dave