https://devzone.nordicsemi.com/f/nordic-q-a/18480/buttonless-dfu-example-with-custom-service-uuidsHello, I have a standalone application which incorporates 3 public BLE services and 2 services with custom UUIDs. Today I tried to extend the buttonless DFU example with these services. Everything works fine unless I try to add my custom servicesen-USTelligent Community 13Mon, 19 Dec 2016 15:08:38 GMThttps://devzone.nordicsemi.com/thread/71283?ContentTypeID=1Mon, 19 Dec 2016 15:08:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e10cda3e-3828-4a28-9bf0-f7cac573f9c5mr91<p>Solved the problem, thank you. There was a different Base UUID in the dfu service.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/71282?ContentTypeID=1Mon, 19 Dec 2016 14:44:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:39af1ae8-f80a-440b-bcf9-de9ab48057f2Hung Bui<p>Hi,</p> <p>You can test your buttonless application without the bootloader. You can add breakpoint, add UART/RTT trace, step the code. The switching to bootloader won&#39;t work but you can debug all the way until that point.</p> <p>When do you receive &quot;APP_ERROR:ERROR:Fatal&quot; ? What caused that error ? Note that the buttonless service is simply a proprietary/customer service, it&#39;s no different from a normal custom service.</p><div style="clear:both;"></div>