https://devzone.nordicsemi.com/f/nordic-q-a/84460/connect-and-paring-issuesWhen the phone and controller bonding gets out of sync we are having issues. By out of sync I mean that either the controller (customer board with a nRF52840) or the phone no longer has the bond information. For example if a phone and a controller areen-USTelligent Community 13Mon, 07 Feb 2022 12:14:43 GMThttps://devzone.nordicsemi.com/thread/351517?ContentTypeID=1Mon, 07 Feb 2022 12:14:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:375e227b-0a72-43aa-adce-664da900f146Amanda Hsieh<p>Hi,&nbsp;</p> <p>That&#39;s the correct flow. <span>Instead of allowing to repair you delete bonds, so that the peer would have to connect again, and then pairing would succeed. This does not provide better security, as the security issue with allowing repairing is that an attacker can spoof a peered device and that way replace it&#39;s bond. This would also be the case here. If you want to&nbsp;</span>allow to repair the bond, see<span>&nbsp;</span><a href="https://devzone.nordicsemi.com/f/nordic-q-a/38663/keep-getting-failed-to-secure-connection-error/156832#156832">this post.</a></p> <p>Regards,<br />Amanda</p><div style="clear:both;"></div>