https://devzone.nordicsemi.com/f/nordic-q-a/95011/complete-reset-of-nrf9160A colleague of mine was playing around with the modem settings for a 9160 and now the device refuses to connect to the cellular network. I&#39;ve reflashed the device including at_client. I&#39;ve reflashed the modem. I&#39;ve tried multiple, known good SIMs. Ien-USTelligent Community 13Mon, 19 Dec 2022 19:24:26 GMThttps://devzone.nordicsemi.com/thread/401359?ContentTypeID=1Mon, 19 Dec 2022 19:24:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e0a57d6a-1bda-47e5-89c5-f4658aa8ad4bdboling<p>That worked! Thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/401355?ContentTypeID=1Mon, 19 Dec 2022 19:15:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3fe4dd28-604a-4061-ac84-108b2e30bbe7kingston<p>Got it, so your device can see the towers, it just isn&#39;t registering.&nbsp; The good news is it means the device and antennas are functional.&nbsp; Since you have tried reflashing the software and device firmware, try the AT command&nbsp;</p> <h1 id="ariaid-title1" class="title topictitle1"><code>%XFACTORYRESET=0</code></h1> <p><code></code></p> <p><span style="font-family:monospace;">If that doesn&#39;t get you connected, maybe your AT_client example code was modified.&nbsp; You can always download a new NCS repo and try again from a known good at_client copy.</span></p> <p><span style="font-family:monospace;"></span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/401353?ContentTypeID=1Mon, 19 Dec 2022 19:07:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a1c4204d-78a5-40d8-924f-48fc4e3d3d4bdboling<p>Just tried with at_client. Here&#39;s the output after I hit the &#39;search networks&#39; button:</p> <pre>AT+COPS=?</pre> <pre class="ctrl-char CR"></pre> <pre class="ctrl-char LF"></pre> <pre>+CEREG: 2</pre> <pre class="ctrl-char CR"></pre> <pre class="ctrl-char LF"></pre> <pre>+COPS: (1,&quot;&quot;,&quot;&quot;,&quot;311480&quot;,7),(1,&quot;&quot;,&quot;&quot;,&quot;310410&quot;,7),(1,&quot;&quot;,&quot;&quot;,&quot;313100&quot;,7)</pre> <pre class="ctrl-char CR"></pre> <pre class="ctrl-char LF"></pre> <pre>+CME ERROR: 521</pre><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/401348?ContentTypeID=1Mon, 19 Dec 2022 18:26:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f576b4f7-1a78-4da9-97c3-db94830f01d5kingston<p>Can you expand on refuses to connect?&nbsp; Do you mean in LTE link monitor it never registers to a tower or it never even sees a tower to register to?</p><div style="clear:both;"></div>