https://devzone.nordicsemi.com/f/nordic-q-a/49880/lte-m-network-not-found-with-nrf9160-and-modem-firmware-version-1-0-0I 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 modemen-USTelligent Community 13Fri, 02 Aug 2019 08:43:31 GMThttps://devzone.nordicsemi.com/thread/202059?ContentTypeID=1Fri, 02 Aug 2019 08:43:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2558dc1d-92fc-4f6c-a839-0ab03b285171Hakon<p>As Michael said you should probably confirm that you are in the right mode using the XSYSTEMMODE command.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/201250?ContentTypeID=1Tue, 30 Jul 2019 12:40:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f5046c6e-4dd4-49db-99e0-e810def60683GiulianoFranchetto<p>Same issue with our board. No LTE connection since v1.0.0 and an iBasis card.</p> <p>CEREG is always +CEREG: 2,4,&quot;FFFE&quot;,&quot;FFFFFFFF&quot;, 7</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/200030?ContentTypeID=1Tue, 23 Jul 2019 11:40:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ec791b39-293d-4516-94e2-b3ebe3952b35MJD093<p>Just looking at your modem output, I noticed two things.</p> <p>You haven&#39;t called XSYSTEMMODE before starting the modem, you should probably do that to check what mode of operation the modem is in. It should default to LTE-M but better to be sure.</p> <p>Secondly, you are connected to the network. The final commands outputted in your log had CEREG: 5 with an eNodeB identification hex. Your DK seems to have registered with your local cell tower.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/199977?ContentTypeID=1Tue, 23 Jul 2019 09:28:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f08243d0-ece9-4dbb-a721-1c3e2008e714Andrea<p>Yes</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/199974?ContentTypeID=1Tue, 23 Jul 2019 09:27:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4f4c611f-21aa-43f3-8b39-6a8ec3b7740eHakon<p>Yes, but I haven&#39;t found any solution yet. Are you using an iBasis SIM card?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/199725?ContentTypeID=1Mon, 22 Jul 2019 09:58:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7b55fc08-b5d5-4f3b-a1b2-6a86133176baAndrea<p>Hakon, have you had a chance to look at the logs?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/199182?ContentTypeID=1Thu, 18 Jul 2019 09:13:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8ec2c938-c6d2-44d4-9f1f-2fe47d091eebAndrea<p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/3058.2019_2D00_07_2D00_18T09_5F00_07_5F00_59.923Z_2D00_log.txt">devzone.nordicsemi.com/.../3058.2019_2D00_07_2D00_18T09_5F00_07_5F00_59.923Z_2D00_log.txt</a></p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/trace_2D00_2019_2D00_07_2D00_18T09_2D00_08_2D00_10.085Z.bin">devzone.nordicsemi.com/.../trace_2D00_2019_2D00_07_2D00_18T09_2D00_08_2D00_10.085Z.bin</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/199162?ContentTypeID=1Thu, 18 Jul 2019 08:48:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e8fe8301-3367-4a6a-b6b6-e9eea60a4b2fHakon<p>Hello,</p> <p>&nbsp;</p> [quote user=""]Is there a way to downgrade the modem firmware?[/quote] <p>&nbsp;No, it&#39;s not possible.</p> <p>&nbsp;</p> [quote user=""]How can I debug this?[/quote] <p>&nbsp;Please do a modem trace as explained <a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/how-to-get-modem-trace-using-trace-collector-in-nrf-connect">here,</a> and post the lte link monitor log as well.</p><div style="clear:both;"></div>