How to change nRF9160's default modem firmware from M1 to NB1

RE: How to change nRF9160's default modem firmware from M1 to NB1

bbslhb — Mon, 01 Jul 2019 02:01:09 GMT

Hi, jbrzozoski:

I tried AT+CFUN=0 and it saved MODE settings.

I tried AT+CFUN=1 and AT+CFUN=4 but didn't try AT+CFUN=0 and that's why I ask here.

MODE setting can be saved so I don't need to change code. I can use the old bin file generated 3 months ago to test this new firmware.

Thanks for your answer.

RE: How to change nRF9160's default modem firmware from M1 to NB1

jbrzozoski — Fri, 28 Jun 2019 14:50:07 GMT

Further down in that link, it also says this:

If the modem is shut down gracefully before the next boot (by using AT+CFUN=0), it keeps the current setting.

That's not very explicit, but what it's trying to say that the current setting of AT%XSYSTEMMODE will also be saved to NVM by doing AT+CFUN=0, which will change the value used by default on power up.

RE: How to change nRF9160's default modem firmware from M1 to NB1

bbslhb — Fri, 28 Jun 2019 03:10:32 GMT

Hi Martin.

I enterd this link and got the official answer that the default mode will be LTE-M after reset or power lost and can't be changed.

You must use CONFIG_LTE_NETWORK_MODE_NBIOT to manually change the mode at your app code If you want to use NB-Iot.

Thank you.

RE: How to change nRF9160's default modem firmware from M1 to NB1

Martin Lesund — Thu, 27 Jun 2019 10:52:09 GMT

Hi Li,

You can set the network mode as described in the documentation.