https://devzone.nordicsemi.com/f/nordic-q-a/112040/the-dtm-test-failed-procedureDear all: Customer products in normal mode, BLE works normally, all functions are OK. An error occurred in DTM mode during authentication. Procedure The failure status is as follows:en-USTelligent Community 13Thu, 13 Jun 2024 12:09:41 GMThttps://devzone.nordicsemi.com/thread/488668?ContentTypeID=1Thu, 13 Jun 2024 12:09:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7c1d9dac-79c0-4b2d-bf5f-d9b2d15e564dJONATHAN LL<p>Hello,<br /><br />Since this is a custom board, what pins are you using for UART communication? Make sure that you have the correct pins set up for communication.<br /><br />&nbsp;<a href="https://raytac.blog/2023/11/22/navigating-rf-certification-a-guide-to-dtm-and-radio-testing/">https://raytac.blog/2023/11/22/navigating-rf-certification-a-guide-to-dtm-and-radio-testing/</a>&nbsp;<br /><br /><a href="https://jimmywongiot.com/2021/03/02/rf-physical-test-on-the-nrf5-series/">https://jimmywongiot.com/2021/03/02/rf-physical-test-on-the-nrf5-series/</a>&nbsp;<br /><br />Regards,<br />Jonathan</p><div style="clear:both;"></div>