LTE-M network not found with nrf9160 and modem firmware version 1.0.0

[Andrea]

I have two nrf9160, one with modem firmware 0.7.29-alpha and the other with modem firmware 1.0.0. With the latest firmware the search for LTE-M network fails while with the old firmware it works. How can I debug this? Is there a way to downgrade the modem firmware?

[Hakon]

Hello,

 

Is there a way to downgrade the modem firmware?

 No, it's not possible.

 

How can I debug this?

 Please do a modem trace as explained here, and post the lte link monitor log as well.

[Andrea]

Hakon, have you had a chance to look at the logs?

[Hakon]

Yes, but I haven't found any solution yet. Are you using an iBasis SIM card?

[Andrea]

Yes