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118	118	(% id="cke_bm_37736S" style="color:red; display:none" %)** **(% 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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120		-[[image:image-20240814155410-1.png||height="328" width="563"]]
	120	+[[image:image-20240822090554-1.png||height="501" width="656"]]
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123	123	== 4.1 For -NB /-NS model ==
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327	327	==== 4.1.2.4 Re-upgrade the firmware ====
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330		-After the certificate configuration is completed, Re-upgrade to the firmware you originally used.
	330	+After completing the certificate configuration, Burn the [[bootloader>>https://www.dropbox.com/sh/u0uzvvnn58yrie4/AAAvvF_KRveNgmDejzp23ziLa/NB-IoT/Bootloader?dl=0&subfolder_nav_tracking=1]] firmware first, then re-burn the original working [[firmware>>https://www.dropbox.com/sh/u0uzvvnn58yrie4/AACREHllkTe0rATD4ZOqddyga/NB-IoT?dl=0]].
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333	333	== 4.2  For -CB /-CS model ==