2.6 Downloading System Reconfig Files andUpdating the Current Systems2.6.1 Updating the BHT SystemYou may update the current BHT system in System Mode in the following two processes.(1) Download a BHT system reconfig file to the BHT from the host PCDownload a BHT system reconfig file by using the BHT's downloading function—the DOWNLOAD menuor FTP MENU.(2) Update the current BHT systemUse the BHT system updating menu (SYSTEM MODIFY) to update the BHT system.Upon completion of updating, the BHT will automatically turn itself off. (Refer to Section 2.5.3, [13.1].)To avoid a low-battery problem during the system updating operation, ensure that the BHT hassufficient battery power or keep the BHT placed on the CU.Even if the BHT is shut down during the operation due to a low-battery problem, turning it oncan resume the system updating operation.During system updating, the PW key is disabled so that the BHT cannot be turned off. Wait forcompletion of updating and then press the PW key.The latest BHT system reconfig file can be downloaded from our Web site.http://www.denso-wave.com/114