The process of downloading the Sony NVU-74T Navigation System Firmware 4.01 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 NVU-74T Navigation System Firmware 4.01 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 NVU-74T Navigation System Firmware 4.01 diver.