https://devzone.nordicsemi.com/f/nordic-q-a/10809/dfu-questionHello, I&#39;ve built &quot;bootloader&quot; project in sdk6 and sdk8, which named &quot;sdk6_bootloader.hex&quot; and &quot;sdk8_bootloader&quot;. Then what I did are listed as below: (1) using &quot;nRFGo Studio&quot; to load -- 1. Softdevice 7 and sdk6_bootloader.hex 2. Softdeviceen-USTelligent Community 13Mon, 28 Dec 2015 05:30:37 GMThttps://devzone.nordicsemi.com/thread/40404?ContentTypeID=1Mon, 28 Dec 2015 05:30:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f0142a19-5bc2-4743-af91-4bb8cabb4fd8sara<p>I&#39;ll have a try, thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/40403?ContentTypeID=1Fri, 11 Dec 2015 13:53:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:38a0b0f2-b578-44cf-829c-3485888f47ecHung Bui<p>Hi Sara,</p> <p>Please try with SDK v7.2 instead of SDK v6.0. The bootloader setting structure has been changed between the bootloader on SDK v6.0 and SDK v8.0 and that may cause the issue.</p> <p>If you still have the issue, please try to run the (updated) bootloader in debug mode and step through the code to see what caused the problem. To configure the bootloader to be more friendly to debug mode, please have a look at question F <a href="https://devzone.nordicsemi.com/blogs/685/common-faq-on-dfu/">here</a>.</p><div style="clear:both;"></div>