https://devzone.nordicsemi.com/f/nordic-q-a/113661/about-ble-connection-of-nrf5340-audioCurrently, I am creating a CIS-connected device using nRF5340 Audio on a homemade board. Since the circuit configurations of the Gateway and Headset are different, I have created separate folders for each and executed the following commands on the commanden-USTelligent Community 13Mon, 05 Aug 2024 13:25:20 GMThttps://devzone.nordicsemi.com/thread/496991?ContentTypeID=1Mon, 05 Aug 2024 13:25:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6044f790-4287-4f58-a328-70d56255fa18Edvin<p>Hello,</p> [quote user=""]If you change the Gateway and write only to the Gateway with the above command, you will not be able to connect to BLE.[/quote] <p>What command exactly do you refer to?</p> <p>Is the Headset already programmed at this point in time? Is the application on the Headset running? Have you tried resetting the Headset after programming the gateway? Perhaps the advertisements have stopped/timed out?</p> <p></p> <p>I don&#39;t know exacty what you are writing to the specific addresses (around 0xFF 80F4). Is this used for filtering of some sort? How do you use that in your application?&nbsp;</p> <p></p> <p>Another possibility is that if you are bonding the devices, one device (the Headset) still has the old bonding information, but the newly programmed gateway does not, and hence, the Headset will reject a connection attempt from the gateway, because it no longer has the encryption keys.&nbsp;</p> <p>Does the log from any the devices say anything when they do not connect?</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>