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692	692	This means sensor is trying to join the NB-IoT network but fail. Please see this link for **//[[trouble shooting for signal strenght:99>>doc:Main.CSQ\:99,99.WebHome]]//**.
693	693
694	694
695		-== 5.3 Possible reasons why the device is unresponsive： ==
696		-
697		-
698		-​1. Check whether the battery voltage is lower than 2.8V
699		-2. Check whether the jumper of the device is correctly connected
700		-
701		-[[image:image-20240330175629-2.png]]
702		-3. Check whether the switch here of the device is at the ISP（The switch can operate normally only when it is in RUN）
703		-​
704		-
705		-[[image:image-20240330175554-1.png]]
706		-
707	707	= 7. ​ Order Info =
708	708
709	709