https://devzone.nordicsemi.com/f/nordic-q-a/23460/sdk-13-1-0-doesn-t-enter-boot-mode-on-iosHello, using buttonless_dfu app, the app switch to bootloader as the upload is started with nrf toolbox on android, but with iOS, the upload never starts the LOG error is : &quot;DFU Control point characteristic not found&quot; I&#39;ve read that it&#39;s relateden-USTelligent Community 13Fri, 28 Jul 2017 07:48:01 GMThttps://devzone.nordicsemi.com/thread/92166?ContentTypeID=1Fri, 28 Jul 2017 07:48:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1365c9e8-86cc-4fe8-9d1d-00b50d33c254cedric<p>thanks for the answer</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/92165?ContentTypeID=1Thu, 13 Jul 2017 12:22:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9471b71b-5aba-4a32-b77a-9e316ddcdd9ebjorn-spockeli<p>Both the ble_app_buttonless andbootloader_secure_ble examples in SDK v13.x.x include the Service Change Characteristic by default. So unless you&#39;ve explicitly disabled it, then this should be included, i.e. set to 1. It could still be that the iPhone has cached the GATT table of the nRF5x device if you have bonded to it previously. Could you try to disable and re-enable the Bluetooth adapter on your iPhone and see it that resolves the issue?</p><div style="clear:both;"></div>