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Step 3. Open the serial port tool and use the file sending method to open RF_Setting3.49.exe. After the device is
connected to the network server normally, click "send file" and the sending is completed as shown below.：
Step 4. The server (the external network mapping used for this demo, the server is the TCP debugging tool), after
receiving the data, as below：
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E840-TTL-4G02E User Manual
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