https://devzone.nordicsemi.com/f/nordic-q-a/48217/nrf52-sdk15-3-pca10040-secure-bootloader-exemple-flash-failHello, I use the board pca10040 v1.2.4 with the SDK 15.3 I started from the example: dfu \ secure_bootloader on Keil. I can flash without worry the softdevice and compile the bootloader. but when I want to flash the bootloaderen-USTelligent Community 13Thu, 26 Sep 2019 09:38:21 GMThttps://devzone.nordicsemi.com/thread/212007?ContentTypeID=1Thu, 26 Sep 2019 09:38:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ae9b7417-3db5-4320-9b06-c1a69e4baff7sarah_sdw<p>I change the address of MBR&nbsp;parameter page&nbsp;and I have no problem now.</p> <p>in nrf_mbr.h:</p> <p>old:&nbsp; MBR_PARAM_PAGE_ADDR (0xFFC)</p> <p>new:&nbsp;<span>MBR_PARAM_PAGE_ADDR (0x10001018)</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/191936?ContentTypeID=1Tue, 11 Jun 2019 07:56:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e7f0964a-9b55-437d-a36b-c8ae5b9f9a8aSimon<p>It guess your problem is the same as in the thread you are pointing to, the&nbsp;entire page has to be cleared before the bootloader can be flashed. However, the suggested solution will only work if you are debugging it.</p> <p>Have you tried flashing it manually, using nrfjprog? Try the suggestions in <a href="https://devzone.nordicsemi.com/f/nordic-q-a/45261/dfu-example-not-working">this thread</a>.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>