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	6	+= 1. Burn the Configure certificate. =
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	8	+**hex** firmware.
	9	+
	10	+After burning, the serial port displays as follows：
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	12	+[[image:image-20240520093014-1.png]]
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	16	+= 2. Configure CA certificate. =
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	18	+Please input the certificate in PEM format for the user. (The format of the image is entered casually, not in PEM format.)
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	20	+Use the AT command **AT+CACERT** as follows:
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	22	+The following certificates are for free input. Please enter the complete certificate when using them.
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	24	+[[image:image-20240520093355-2.png]]
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	26	+If the configuration succeeds, the message "CA certificate configuration succeeded" is displayed. Otherwise, the configuration fails.
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