Serial LTE Modem example code is not working in my custom board ( nRF9160 is virgin ) but it is working in Feather circuitdojo

[Dvls]

Hii There,

SiP Module : nRF9160 (virgin module)
Board : Costume board (same as feather circuitdojo)
example : Serial LTE modem
IDE : VS code

The problem is when i send AT command in SLM Serial, it cause device reboot, other then simple serial is working.

Processes :
Working in feather circuitdojo
- I have used Serial LTE Modem example code and modified UART pins, and compiled using board : nrf9160dk_nrf9160_ns, after compile this flash into feather circuitdojo board using jlink, and it working.

Not Working in custom board
- same compiled binary flashing in my custom board using same tool, its not working.

Question:
- so there is any specific things that i have to do with virgin nRF9160 SiP ?

Best regards,
Dvl

Edited : 

nrf_modem_at_cmd() function is returning 65536 value

[Hakon]

Hello,

- so there is any specific things that i have to do with virgin nRF9160 SiP ?

Can you please explain what exactly you mean by "virgin nRF9160 SiP"?

The problem is when i send AT command in SLM Serial, it cause device reboot, other then simple serial is working.

Can you include some logs? The nrf9160 usually doesn't just reset spontaneously without printing some sort of error message. You should enable CONFIG_RESET_ON_FATAL_ERROR=n.

[Dvls]

Hi Hakon,

    thanks for your reply. 

I managed to find the problem. 

    1. Our custom PCB has the option for eSIM or regular SIM and the jumper for this is not connected, so pin is floating

    2. I had to update modem firmware as describe here : docs.conexiotech.com/mfw 

So, Now this ticket can be close

Thanks,

Dvl