https://devzone.nordicsemi.com/f/nordic-q-a/113636/esim-uicc-initialization-failed-on-custom-boardHi, I&#39;m currently working on getting LTE to work on our custom card, featuring an nRF9161 and an MFF2 eSIM (without PIN), but I can&#39;t seem to initialize our eSIM. I have flashed the latest version of the modem firmware available ( mfw_nrf91x1_2.0.1en-USTelligent Community 13Fri, 02 Aug 2024 17:10:28 GMThttps://devzone.nordicsemi.com/thread/496857?ContentTypeID=1Fri, 02 Aug 2024 17:10:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8068814c-9bec-49fb-b79a-baace202f798rajeev<p>Mike, I hope you have followed these steps for writing and verifying the IMEI</p> <p><br />See my response in this thread here:<br /><a href="https://devzone.nordicsemi.com/f/nordic-q-a/112106/unable-to-write-imei-using-imeiwrite-to-nrf9161">https://devzone.nordicsemi.com/f/nordic-q-a/112106/unable-to-write-imei-using-imeiwrite-to-nrf9161</a><br /><br />Make sure that after writing you are getting the IMEI number that you wrote to the nRF9161 else your write did not work as expected.<br />Quick and easy way to test is use LTE monitor on the old version of nRF Connect APP and this will simplify your test workflow.<br /><br />How to do that is here<br /><a id="" href="https://docs.conexiotech.com/master/nrf-connect-lte-link-monitor">https://docs.conexiotech.com/master/nrf-connect-lte-link-monitor</a></p> <p>All the best...</p> <p>rajeev</p><div style="clear:both;"></div>