https://devzone.nordicsemi.com/f/nordic-q-a/8752/nrf51422-51822-what-s-the-detailed-power-on-sequence-when-using-softdevice-bootloader-appI&#39;m a newbie for Nordic development. I just noticed that softdevice, app, and bootloader share the same CPU, RAM and Flash at the same time. This three software modules all has its own vector tables . I know that ARM CPU will run into reset vectoren-USTelligent Community 13Mon, 17 Aug 2015 11:53:51 GMThttps://devzone.nordicsemi.com/thread/32091?ContentTypeID=1Mon, 17 Aug 2015 11:53:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:726e3317-9531-4798-972b-eb1f7765d8b6Hung Bui<p>Hi xiaozuanzi,</p> <p>The MBR&#39;s(comes with the softdevice) vector table will be accessed first.</p> <p>You can have a look at section B in <a href="https://devzone.nordicsemi.com/blogs/685/common-faq-on-dfu/">this FAQ</a>, to know more about the start-up sequence.</p><div style="clear:both;"></div>