The process of downloading the Yeastar MyPBX U300 IP Phone System Firmware 12.20.0.21 Beta driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the Yeastar MyPBX U300 IP Phone System Firmware 12.20.0.21 Beta driver from the primary server - this is the manufacturer’s Yeastar 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 Yeastar MyPBX U300 IP Phone System Firmware 12.20.0.21 Beta diver.