https://devzone.nordicsemi.com/f/nordic-q-a/97086/how-to-set-device-security-level-mode1-level4hi I am configuring a BLE peripheral using NCS v2.2.99-dev3 and the nRF5340 DK. I want to set the security level of the device to mode1, level 4 for cyber security. I searched several tickets to get the information, but the security level change is failingen-USTelligent Community 13Mon, 27 Feb 2023 22:45:43 GMThttps://devzone.nordicsemi.com/thread/412372?ContentTypeID=1Mon, 27 Feb 2023 22:45:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:32b85658-b674-4f36-a099-69a86e2e620aAmanda Hsieh<p>Hi,&nbsp;</p> <p><span>First of all, for numeric comparison to work, you need a display and buttons to confirm or reject the&nbsp;passkey on&nbsp;</span><em>both</em><span>&nbsp;devices. If the peripheral only has a display, the standardized approach would be to display the passkey on the peripheral and enter the passkey on the central, assuming you have a keyboard capable of inputting digits on the central. You can of course just fake this and always accept on the peripheral, as it seems to me is what you&nbsp;intend to do, but that is not directly supported or described in the Bluetooth specification.&nbsp;From a firmware perspective, it does not matter much if the input comes from the real-world or internally though, so it&nbsp;is&nbsp;fine with regard to the implementation. Try to use&nbsp;</span><span>bt_conn_auth_pairing_confirm</span><span>(</span><span>auth_conn</span><span><span>); instead of&nbsp;</span></span><span>bt_conn_auth_passkey_confirm</span><span>(</span><span>auth_conn</span><span>);.</span></p> <p><span>Regards,<br />Amanda H.</span></p> <p></p> <p><span></span></p> <div></div><div style="clear:both;"></div>