https://devzone.nordicsemi.com/f/nordic-q-a/15545/crash-on-accessing-flash-after-copying-softdeviceI&#39;m trying to update my SoftDevice with a bootloader, which is basically the same as the one in nRF5_SDK_11.0.0_89a8197. The image is saved in bank 0 and is validated by dfu_sd_image_validate where sd_mbr_command with SD_MBR_COMMAND_COMPARE is executeden-USTelligent Community 13Thu, 04 Aug 2016 13:26:35 GMThttps://devzone.nordicsemi.com/thread/59345?ContentTypeID=1Thu, 04 Aug 2016 13:26:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ea81d2f5-c440-4f69-b137-06121440a46bVanNuru<p>As my bootloader was basically the same as one in the SDK, it was not completely. For instance, I replaced <code>sd_image_start</code> with the define <code>DFU_BANK_0_REGION_START</code>, as this was always going to be its location, thus making the variable useless.</p> <p>The problem with that is, after copying the SoftDevice image into the SoftDevice region, somehow the <code>dfu_types.h</code> defines like <code>DFU_BANK_0_REGION_START</code> returned totally wrong values. Thus all functions originally using <code>sd_image_start</code> got wrong parameters, which caused the crash.</p><div style="clear:both;"></div>