https://devzone.nordicsemi.com/f/nordic-q-a/59809/bootloader-hex-file-cannot-download-in-the-nrf52833-dk-boardHi,i use the bootloader demo code , the file path is nRF5_SDK_16.0.0_98a08e2\examples\dfu\secure_bootloader\pca10056_s140_ble\arm5_no_packs ,a fter I compiled and passed, I used NRF connect to program the hex file,my steps are as follows: tool: NRF52833en-USTelligent Community 13Fri, 03 Apr 2020 00:25:37 GMThttps://devzone.nordicsemi.com/thread/243280?ContentTypeID=1Fri, 03 Apr 2020 00:25:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:25845a08-9713-4bd6-8629-c6ac51be4bb2summer<p><span>Thank you very much，I have solved the problem。</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/243193?ContentTypeID=1Thu, 02 Apr 2020 12:46:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:33dfdab8-33ef-493b-9016-b0926ce385b5Hung Bui<p>Hi Summer,&nbsp;<br />It seems the location of the bootloader was pretty wrong. Have you modified the start address of the bootloader ? It should start at 0x78000.</p> <p>I can see that you were using the project inside <strong>PCA10056_s140_ble</strong>. This project is for the nRF52840 not the nRF52833.&nbsp;<br />Please use the bootloader inside <strong>pca10100_s140_ble</strong> instead.&nbsp;</p><div style="clear:both;"></div>