Please kindly be noted that we have released new firmware Version 2.8 of Vigor3100 series. You could download the formal released firmware and new Documents from following URL: https://www.draytek.com/support/download/Vigor3100.php.
Please refer the new functions and Improvements & Corrected Problems.
[New Features] - Support 3G USB Modem Backup. - Support ISDN model (Vigor3100i).