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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]]//**.
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	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	+
695	695	= 7. ​ Order Info =
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