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774	774	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]]//**.
775	775
776	776
	777	+== 6.4 Possible reasons why the device is unresponsive： ==
	778	+
	779	+
	780	+​1. Check whether the battery voltage is lower than 2.8V
	781	+2. Check whether the jumper of the device is correctly connected
	782	+
	783	+[[image:image-20240330174534-1.png]]
	784	+3. Check whether the switch here of the device is at the ISP（The switch can operate normally only when it is in RUN）
	785	+
	786	+[[image:image-20240330174542-2.png]]
	787	+​
	788	+
777	777	= 7. ​ Order Info =
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779	779