The process of downloading the Sierra Wireless AirCard 300 Card Driver 1.2.7 driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the Sierra Wireless AirCard 300 Card Driver 1.2.7 driver from the primary server - this is the manufacturer’s Sierra Wireless 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 Sierra Wireless AirCard 300 Card Driver 1.2.7 diver.