https://devzone.nordicsemi.com/f/nordic-q-a/74577/the-program-time-sequence-when-52840-poweronHi guys. I wonder the program run start from which section and how to enter the app when 52840 poweron? Start from SofeDevice? I only flashed ble_app_uart and SoftDevice, the program can run normally. I flashed three hex: bootloader / ble_app_uarten-USTelligent Community 13Fri, 30 Apr 2021 02:44:27 GMThttps://devzone.nordicsemi.com/thread/307577?ContentTypeID=1Fri, 30 Apr 2021 02:44:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2557bf59-6261-477b-aaf3-725375847221oplinux<p>Berg. Thanks for your prompt response.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/307533?ContentTypeID=1Thu, 29 Apr 2021 14:30:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aafe3f4f-5a08-46d9-b6de-8775c91fa0ebVidar Berg<p>Hi,</p> <p>Address 0x0 is always the entry point after a reset. You can read more about the startup sequence in the Softdevice specification here:</p> <p><span><a title="Master boot record and SoftDevice reset procedure" href="https://infocenter.nordicsemi.com/topic/sds_s140/SDS/s1xx/mbr_bootloader/mbr_sd_reset_behavior.html?cp=4_7_4_0_11_2">Master boot record and SoftDevice reset procedure</a></span></p> <p><span>Picture for illustration (the numbers indicate boot order):</span></p> <p><span><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1619706564707v1.png" alt=" " /></span></p><div style="clear:both;"></div>