lte_lc: Failed to set functional mode. Please check XSYSTEMMODE nrf9160

[park jae wan]

I'm checking the function by uploading the code to the pcb that uploaded the nrf9160 chip.

I checked that the network communication is normal on the previous 9160dk board.

As a result of uploading the code to the custom board and trying again, it has been confirmed that there is a problem with the modem as shown below.

[00:01:21.507,904] <err> lte_lc: Failed to subscribe to CEREG notifications, error: 65536
[00:01:21.507,904] <err> lte_lc: Failed to enable notifications, error: -14
[00:01:21.507,904] <err> nrf_modem_lib_netif: lte_lc_func_mode_set, error: -14
[00:01:21.507,934] <inf> NRFX_EXAMPLE: conn_mgr_all_if_connect, error: -14
[00:01:31.515,136] <err> nrf_modem_lib_netif: Modem error: 0xfff, PC: 0x0
[00:01:31.515,167] <err> lte_lc: Failed to set functional mode. Please check XSYSTEMMODE.
[00:01:31.515,167] <err> nrf_modem_lib_netif: lte_lc_func_mode_set, error: -14
Fatal error received from the connectivity layer
getaddrinfo() failed, err -11
[00:01:33.515,350] <err> lte_lc: Failed to set functional mode. Please check XSYSTEMMODE.
[00:01:33.515,380] <err> nrf_modem_lib_netif: lte_lc_func_mode_set, error: -14
[00:01:33.515,411] <inf> NRFX_EXAMPLE: conn_mgr_all_if_disconnect, error: -14

I don't know how to change the uart pin and see if the modem's firmware is the problem.

It would be nice if you could give me some advice.

Thank you.

[park jae wan]

Sorry for the late reply.

First of all, there was a p0.14 p0.13 uart pin, so I opened the uart pin.
The test was carried out using the serial lte modem code using the AT command. However, unlike the previous development board where the AT command was executed, it was found that the following strange characters were continuously printed in the serial monitor window.

In addition, I confirmed that the Ready phrase is output when I look at the phrase output through the at_client.

I don't have a clue what the problem is yet. Is there any other way to check?

[Øyvind]

park jae wan said:

I confirmed that the Ready phrase is output when I look at the phrase output through the at_client.

Are you able to send commands to your device? Try with the following commands

AT%XSYSTEMMODE=1,0,1,0 

AT+CFUN=1

[park jae wan]

thank you for answer 

Suddenly, I checked the OK message to see if the uart AT command was transmitted.

So I tried the command you sent,

AT
OK
AT%XSYSTEMMODE=1,0,1,0

OK
AT+CFUN=1
ERROR

I got the following results.

why AT+CFUN=1 ERROR appeared?

is that fw version problem?

[Øyvind]

Using the same application, what does this command return? AT+CGSN=1

[park jae wan]

Updated modem firmware version to 1.3.7.

Nevertheless, there is a problem with Internet registration as follows. Why is that??

and i try command that AT+CGSN=1 

+CGSN: "350916069243163"
OK

that result