User's Manual

User manual Version 1.2

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Ethernet-Serial Server

GW21W-MAXI

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Appendix C. Hardware Configuration

C.1 Disable System Firmware

The AP (application program) firmware of GW21W-MAXI can be disabled. This function is used in the

situation that you downloaded a wrong version of firmware that caused the system crashed.

To disable the current version of firmware and prevent it from executing, please do the followings:

1. Turn the power off, open the case of GW21W-MAXI.

2. Short the Jumper JP7 and JP8 on the right-top corner from the main board to disable AP

firmware.

3. Power on GW21W-MAXI.

4. Download the correct AP firmware to GW21W-MAXI.

5. Remove the Jumper JP7 and JP8 to enable AP firmware.

6. Close the case and continue your operations.