The process of downloading the ADTRAN T3SU 300 Firmware 1.00M driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the ADTRAN T3SU 300 Firmware 1.00M driver from the primary server - this is the manufacturer’s ADTRAN official website). If the download still fails to run, check whether your anti-virus software is not blocking the connection to the manufacturer server of the ADTRAN T3SU 300 Firmware 1.00M diver.