Hello Rui Jorge,
 
Thank you for your request for Technical Support.
Can you please try fw 2.3.0RC3?
http://openupload.draytek.com/openupload/www/?a=d&i=peb4yI2hSh 

And there is a limitation that login credential must be default in the first time.
Also the detection process could take up to 3 minutes.
Thank you.

Best regards,
Louis Hsu
FAE Department / DrayTek Corp.
DrayTek: for Vigorous Broadband Access
http://www.draytek.com