76 CONTENTS TH-D72A/E9 HOW TO UPDATE FIRMWAREThis section describes how to update the firmware of the TH-D72A/E transceiver itself and of theTNC.In order to update the equipment, each of the following is required:• Equipment to be updated (TH-D72A/E)• Computer• Communication cable (USB Cable that comes with TH-D72A/E)• Firmware update programKenwood provides the firmware update program for use on Windows operating systems. Thespecifications for your computer in order to use this software are as shown in Table 9-1.Table 9-1 Firmware Update Computer Specifications TableNote: Upon connecting the transceiver to a PC using a USB cable, ensure that the connection has securely been in place. Thefirmware updating program may not behave properly if connecting through a USB hub. Download and install the virtual COM port driver to make a USB connection possible for command communications via a USBconnector.Virtual COM Port Driver: http://www.kenwood.com/i/products/info/amateur/vcp_e.html This firmware updating program cannot read and write user data such as menu items and memory channel frequencies. Ifyou do not wish to lose user data, save the data using the MCP-4A Memory Control Program prior to updating the firmwareand writing the data back after updating the firmware.9.1 Firmware9.2 Verifying Necessary EquipmentComputer Required SpecificationOperating System Windows XP (Service Pack 3 or later), Windows Vista (Service Pack 1 or later) (32-bit/64-bit), or Windows 7 (32-bit/ 64-bit)CPU CPU or compatible CPU that is equivalent or superior to the CPU recommended for theOperating SystemMemory More than OS recommended capacityHard Disk 30 MB or more free spaceCommunication Port USB 2.0 interface