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Can the USB/Micro USB cable (part number: C445XS-USBMICRO) for the C445 Motor Management relay be used to upgrade the firmware on the C445?

No, the firmware on a C445 can only be downloaded to the device via the USB/RS485 cable (C445XS-USBLEADS) via the RS485 port or via the USB/RJ12 cable (C445XS-USBRJ12) via one of the RJ12 ports on the C445.