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134	134	* Update through UART TTL interface : **[[Instruction>>url:http://wiki.dragino.com/xwiki/bin/view/Main/UART_Access_for_NB_ST_BC660K-GL/#H4.2UpdateFirmware28Assumethedevicealreadyhaveabootloader29]]**.
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	136	+
136	136	=== 4.1.2 Configure certificate ===
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138		-(% style="color:red" %)**Note: **(%%)In order to avoid problems with certificate writing, you need to set the serial port assistant to automatically add a newline character when sending commands, if there is no such newline character, the certificate written will be invalid.(Using the serial port assistant as an example)
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140		-[[image:image-20240814155410-1.png||height="328" width="563"]]
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142	142	After upgrade the firmware, the serial port displays as follows：
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144	144	[[image:image-20240528174330-13.png||height="286" width="568"]]