https://devzone.nordicsemi.com/f/nordic-q-a/62127/why-no-firmware-to-activateHello Using PCA10040 dev board, Building with SDK 16, &amp; S112 - using ses Running ..\examples\dfu\secure_bootloader\pca10040_uart_debug Using nrfutil to download my package via serial port - all looks good ( package is just app hex file) viaen-USTelligent Community 13Fri, 12 Jun 2020 07:08:24 GMThttps://devzone.nordicsemi.com/thread/254606?ContentTypeID=1Fri, 12 Jun 2020 07:08:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9c8b6c4e-8a3b-4c64-9fd0-dcc9c6ace9acMichaelKilleen<p>Thank you, moved to sample app with ble already included. Updated app with our test code. Building this worked and was also able to upgrade via dfu/boot loader. My previous app was based of sample code with ble support. Not sure what made this work</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/253584?ContentTypeID=1Fri, 05 Jun 2020 14:40:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aaf975a9-357c-4949-800d-a11aa2c82018J&#248;rgen Holmefjord<p>MBR should only be used for updating bootloader, and jumping to bootloader on boot, so I do not think the problem is with that one. You may also try to rebuild the bootloader with a clean SDK in case the application-rebuild does not help.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/253578?ContentTypeID=1Fri, 05 Jun 2020 14:22:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ef2fc1e7-ab26-4a82-9eff-e73396f886b1MichaelKilleen<p>boot loader has different keys, otherwise no difference, when program boot loader get restart messages (maybe some already captured in RTT viewer), nrfutil gets to 100% - Device programmed</p> <p>So possibly messages/errors output not very clear. Going back to build my test app again, may be missed a trick or two in that project. Possibly related to MBR?</p> <p>Thanks</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/253573?ContentTypeID=1Fri, 05 Jun 2020 14:12:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3e18b0a6-e9fb-4b95-9025-758ef0164dcdJ&#248;rgen Holmefjord<p>Have you made many changes to the bootloader? It seems that the log shows multiple resets, is that correct, or have you reset the board yourself?</p> <p>What is the output from &#39;<span>nrfutil dfu serial&#39; command?</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/253301?ContentTypeID=1Thu, 04 Jun 2020 13:06:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ae4cf977-3508-48d3-ab4d-6933348a75c7MichaelKilleen<p>Hi Lorgen,</p> <p></p> <p>Thanks for feedback. Did create and use new private and public keys. The logs message say the that &quot;Image verified&quot;. Do not see message saying something is wrong - should we?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/253287?ContentTypeID=1Thu, 04 Jun 2020 12:28:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7ce85dd1-db0e-4d88-9e5a-4fa3a085aec3J&#248;rgen Holmefjord<p>Hi,</p> <p><span>pca10040_uart_debug can only be used with the test-images in examples\dfu\secure_dfu_test_images, as it uses the public key for Nordic&#39;s un-published private key. Please make sure you follow the <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/sdk_app_serial_dfu_bootloader.html">instructions in the documentation</a> closely, to generate keys, bootloader settings, DFU package, etc.</span></p> <p><span>Best regards,<br />Jørgen</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/253097?ContentTypeID=1Wed, 03 Jun 2020 16:14:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:592bc204-8513-4c81-a020-5367eba7ededMichaelKilleen<p>Title truncated when posted... should be &quot;Why&nbsp;<span>No firmware to activate&quot; ?</span></p><div style="clear:both;"></div>