The process of downloading the Tenda D820B Modem Firmware 4.0_2.8.081224a_b driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the Tenda D820B Modem Firmware 4.0_2.8.081224a_b driver from the primary server - this is the manufacturer’s Tenda 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 Tenda D820B Modem Firmware 4.0_2.8.081224a_b diver.