SMS Software for DVRs This version should only be used on these models Windows 2000 or later required. There are separate programs for the Standard (1024x768)     Upgrade software for DT Series DVRs.  This version should only be used on these models.  This is a full upgrade designed to be copied to USB drive, then boot the system from the USB drive to perform the upgrade.        Upgrade software for LT Series DVRs.  This version should only be used on these models.  This is a full upgrade designed to be copied to USB drive, then boot the system from the USB drive to perform the upgrade.        Upgrade software for ET Series DVRs.  This version should only be used on these models.  This is a full upgrade designed to be copied to USB drive, then boot the system from the USB drive to perform the upgrade.