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nrf9160DK: "Error : AT command timeout" on LTE monitor while using the "AT_client" sample

Hi.

I want to test my iBasis SIM card for NB-IoT with nRF9160DK. So, I tested with the "AT_client" example. I have followed "Getting Start with nRF8160 DK" instruction and I was be able to build and flash without an error.

https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/getting-started-cellular/posts/getting-started-with-nrf9160-dk#h12sjvxvm4sc1llem2r1obrdornr8fpi

nRF Connect version => 3.3.2
Modem firmware version => 1.1.1
myboard : PCA10090

But, It has some problem. I'm still not be able to get any response from the board with AT command.

When I watched this video "LTE Link Monitor introduction" which it also used AT client firmware too. I noticed that I got no message on LTE monitor about zephyr OS booting after pressed the reset button like in the video as shown here...

  

https://www.youtube.com/watch?v=m5V4Vo_Xemk

Could you please help me solve this problem?

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