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

Hello,

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?

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