nRF9160-DK. Update certificate. Can´t get modem in offline state.


I´m trying to update the certificate of my nRF9160-DK. To do this the modem has to be in offline state. I´m running the AT Client sample like it is shown in the chapter Building and running here. But the command "AT+CFUN?" Returns "0" not "4". How can I solve this Problem?