https://devzone.nordicsemi.com/f/nordic-q-a/29945/bootloader-can-not-jump-to-app-after-dfu-operationI use DFU function to update APP. and when i execute the flash write operatin in APP,then afer the dfu operation,bootloader can not jump to the APP. it keeps in bootloadr,and advertising DFU services, and if i programme APP with DFU again, it can jumpen-USTelligent Community 13Tue, 30 Jan 2018 10:21:04 GMThttps://devzone.nordicsemi.com/thread/119099?ContentTypeID=1Tue, 30 Jan 2018 10:21:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a07a07a5-fe84-452b-accb-9bc704fe237bBj&#248;rn Kvaale<p>Have you taken a look at the <a href="https://devzone.nordicsemi.com/blogs/1085/getting-started-with-nordics-secure-dfu-bootloader/">secure dfu blog post</a>? How are you performing the DFU (via nrf connect or nrf toolbox on your smartphone)? If you follow the blog post, the application should start running right after the DFU has been successful. I can recommend following the blog post &amp; only updating the application first. I would try with an easy example, like the blinky ble peripheral example located in <code>examples\ble_peripheral\ble_app_blinky\pca10040\s132\</code>.</p><div style="clear:both;"></div>