Transition Networks MIL-SM808GPXX - Manual (Page 70)

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4-6.Updating Firmware using the Console Port
1. While booting the switch, press the X key to start the Xmodem routine on
the device.
2. Pressing X will cause the switch Xmodem application to begin and cause
the baud rate to change to 57600 bps. You will need to disconnect the
cable connected to the serial port, and change the baud rate of your
hyper-terminal application on your laptop to 57600 bps, then connect the
cable and reconnect to the switch.
3. Select “send file" under the "transfer" menu from menu bar.
4. Press the "browse" button to select the path.
5. Select "1K Xmodem" of protocol and press the "Send" button.