https://devzone.nordicsemi.com/f/nordic-q-a/35940/service-changed-characteristic-requirement-for-iosHi, According to your IOS-Pods-DFU-Library GitHub repo: https://github.com/NordicSemiconductor/IOS-Pods-DFU-Library#service-changed-characteristic In order the DFU to work with iOS, the target device MUST have the Service Changed characteristic withen-USTelligent Community 13Thu, 28 Apr 2022 22:32:35 GMThttps://devzone.nordicsemi.com/thread/365488?ContentTypeID=1Thu, 28 Apr 2022 22:32:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:43baba75-f2c4-4d6d-ba81-e2ea7104111cspicyruby<p>I&#39;m using sdk 15.2.0 service changed characteristic flag has be changed to the following in sdk_config.h file, switching to 1 resets the services upon reconnecting</p> <pre>NRF_SDH_BLE_SERVICE_CHANGED 1</pre><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/165199?ContentTypeID=1Fri, 11 Jan 2019 14:13:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1d2f0459-b8ae-4b36-8272-55c089c68932DyDx<p>This case may be closed</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/165198?ContentTypeID=1Fri, 11 Jan 2019 14:12:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:066f1724-548a-4b3a-97be-060d0fae6605DyDx<p>Ok, thanks so much for your response!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/138806?ContentTypeID=1Tue, 03 Jul 2018 15:21:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7516cd1a-a92d-4ed0-a3ca-bdfb235ee1c2Mttrinh<p>Hi,</p> <p>Yes, the service changed characteristic is a requirement for DFU to work with iOS. You will need this flag set if you want to change your services on a later stage.&nbsp;</p> <p>The reason this flag is not set in the DFU example. is that a workaround have been implemented to foolproof it, so that when people forget to set this flag it is still possible to change your services. So you should set this flag for DFU to work with iOS devices.</p><div style="clear:both;"></div>