https://devzone.nordicsemi.com/f/nordic-q-a/8928/how-to-switch-from-own-bootloader-to-application-using-s120-above-the-bootloaderI have built an application using S120 v2.1.0. The app runs fines from 0x1d000. When I run an own bootloader (RS485, no need of interrupts or S120, no pstorage functions, etc) from 0x1d000, it runs fine too. It erases and flashes the app code beginningen-USTelligent Community 13Thu, 27 Aug 2015 13:37:21 GMThttps://devzone.nordicsemi.com/thread/32858?ContentTypeID=1Thu, 27 Aug 2015 13:37:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2094da6c-4a2e-4793-979a-35498ce8cfdbWolfgang Abends<p>A Hint: As long as I do not call device_manager_init() inside the application code, application is running (in a limited manner of course), started from the bootloader.</p> <p>So, it is not a matter of calling the application from the bootloader (that piece of code works obviously), but a matter of preparing compiler, bootloader, or application code to be able to run together with the softdevice.</p><div style="clear:both;"></div>