https://devzone.nordicsemi.com/f/nordic-q-a/10209/having-trouble-with-single-bank-dfu-nrf51822I&#39;m having trouble making a single bank dfu mode with 128k NRF51822 chip. Here&#39;s the problem; Works fine when everything(SoftDevice, Application, Bootloader) is all uploaded. The Application is launched as expected. I used the Nordic Masteren-USTelligent Community 13Mon, 05 Jun 2017 05:21:29 GMThttps://devzone.nordicsemi.com/thread/37883?ContentTypeID=1Mon, 05 Jun 2017 05:21:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:868f2db8-9eed-4b83-a2bf-abf524a98d03Jackxl<p>Maybe that start address doesn&#39;t match. It can be defition of other start address somewhere (I had this issue).</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/37884?ContentTypeID=1Thu, 12 Nov 2015 09:50:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0dffbede-25f4-4f3d-9757-de63b1c02cf0Vidar Berg<p>Hi, what SDK is this bootloader based on? If your are using one of the newer ones (e.g., version 10.0.0) you only need to replace dfu_dual_bank.c with dfu_single_bank.c, set dfu_types.h-&gt;BOOTLOADER_REGION_START = 0x1c000 and recompile with the following memory layout (for xxAB):</p> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/dfu_5F00_settings.PNG" alt="image description" /></p> <p>With the behavior you describe it sounds like the bootloader is not reaching the NVIC_SystemReset(); call in main.c as it should when the application image has been uploaded. I would suggest to try the approach above and see whether you get the same result or not</p><div style="clear:both;"></div>