https://devzone.nordicsemi.com/f/nordic-q-a/10050/services-changed-notification-sdk-6-1Hi all, we have a project based on nRF51422, SDK 6.1, Softdevice S310 2.0.1. We use the bootloader for DFU services. Our problem is to send a service changed notification when the application resets to restart the system in bootloader (and then inen-USTelligent Community 13Wed, 04 Nov 2015 20:11:19 GMThttps://devzone.nordicsemi.com/thread/37249?ContentTypeID=1Wed, 04 Nov 2015 20:11:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b2ba79d5-9f45-4304-a575-69c3f30c7b15run_ar<p>Not sure what is the most work. Either update to newer SDK and Softdevice, or implement service changed into the old bootloader and your application. Anyway there is a blog <a href="https://devzone.nordicsemi.com/blogs/683/a-quick-presentation-on-how-nrf51-dfu-works/">here</a> and <a href="https://devzone.nordicsemi.com/blogs/685/common-faq-on-dfu/">here</a>. Where the later one describes the current DFU approach so you can see how we handle service changed.</p><div style="clear:both;"></div>