The process of downloading the Sony KLV-40BX400 BRAVIA HDTV Firmware 1.539 driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the Sony KLV-40BX400 BRAVIA HDTV Firmware 1.539 driver from the primary server - this is the manufacturer’s Sony 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 Sony KLV-40BX400 BRAVIA HDTV Firmware 1.539 diver.