As below list, there are 2-ways to insert MAC address using WIZ750SR series and WIZ550 series.
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WIZ750SR series.
After upload firmware, If display from serial to this data (INPUT FIRST MAC?), Send to “MC00:08:DC:xx:xx:xx$0d$0a” data.
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WIZ550 series.
After upload firmware, If display from serial to this data(Input MAC?), Send to “S0008DCXXXXXX” data.