nrf9160 development board doesn't work rightly

[xiao0528]

I have used the nrf9160 development board and it can works rightly. But from this week, it doesn't work. I can download my code to the board, but it doesn't work. When I press the reset button, there is no response. It doesn't restart. The following picture is the log I recieved. I press the reset button many times and there is nothing happended.

[Carl Richard]

Hi!

What kind of application are you running on the device? From what I can see it's enabled with the MCUBoot bootloader, but it doesn't seem to have any (valid) code in the first image slot. If you want to restore the device it should be enough to call "nrfjprog --recover" on the command line.

Best regards,
Carl Richard

[xiao0528]

I am using this example which is ncs1.2\nrf\samples\nrf9160\at_client to run on the board. Then I use LTE Link Monitor in nrf Connect. The result is shown in the picture. There is no response. When I press the reset button, it is still not work. I have tried two development board, they both have this issue.

My colleague can use this example to search network.

[Carl Richard]

Hi again!

I understand. Have you modified the sample in any way? I also suggest moving to a newer version of the nRF Connect SDK (most recent is v1.5.0). 

In addition, what version of the nRF9160DK do you have?

Best regards,
Carl Richard

[xiao0528]

I didn't modify the sample.

I use this board. https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF9160-DK

[Carl Richard]

Thank you. Have you tried to recover the boards by calling "nrfjprog --recover" and then programming the sample again?

Best regards,
Carl Richard

[xiao0528]

I have tried that and programming it again. But there is no effect.