The process of downloading the PENTAX 645D DSLR Camera Firmware 1.31 driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the PENTAX 645D DSLR Camera Firmware 1.31 driver from the primary server - this is the manufacturer’s Ricoh 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 PENTAX 645D DSLR Camera Firmware 1.31 diver.