How to implement DFU for blinky sample code with LED status logs for nRF54L15

RE: How to implement DFU for blinky sample code with LED status logs for nRF54L15

kartik mathad — Tue, 30 Sep 2025 13:34:39 GMT

Hi thank you very much for your help. The target board was the issue. The application is running and I am able to DFU.

RE: How to implement DFU for blinky sample code with LED status logs for nRF54L15

DanielNG — Tue, 30 Sep 2025 11:56:19 GMT

Hi, real quick from your log before I look deeper into this

Building try1
west build --build-dir c:/ncs/Working_Directory/DFU_UART/DFU_with_app/DFU_Try2/try1/build c:/ncs/Working_Directory/DFU_UART/DFU_with_app/DFU_Try2/try1 --pristine --board bl54l15_dvk/nrf54l15/cpuapp --sysbuild -- -DCONF_FILE="prj.conf

it should be nrf54l15dk/nrf54l15/cpuapp.

I tried 2 builds one with your current board target and one with the correct one.

The one with your current board target doesn't work while the one with nrf54l15dk/nrf54l15/cpuapp works as intended which makes sense to me looking at your warnings in your logs.

Can you try this? If it still doesn't work, send me the logs again in a doc.

RE: How to implement DFU for blinky sample code with LED status logs for nRF54L15

DanielNG — Tue, 30 Sep 2025 10:50:57 GMT

Hi, I'm having a hard time recreating your issue. I was able to build/flash the exact code that you provided and have the LED blinking/getting the DK into serial recovery.

Can you try deleting your whole build folder and then create a new build? Also send over your build and flash logs

RE: How to implement DFU for blinky sample code with LED status logs for nRF54L15

kartik mathad — Tue, 30 Sep 2025 08:43:35 GMT

Hi I am using the same one which you have suggested still the same. Base configuration is the prj.conf file, and I am using sysbuild to build option.

devzone.nordicsemi.com/.../2474.try1.zip

RE: How to implement DFU for blinky sample code with LED status logs for nRF54L15

DanielNG — Tue, 30 Sep 2025 08:16:00 GMT

Hi which board target are you using? If you have the nRF54L15 DK, the target should be something like this (starts with nrf54l15dk/)

RE: How to implement DFU for blinky sample code with LED status logs for nRF54L15

kartik mathad — Tue, 30 Sep 2025 04:58:40 GMT

Hi DanielNG thank you for a quick response. There is still no difference, the LED0 does not blink even after adding"

CONFIG_PM_PARTITION_SIZE_MCUBOOT=0xF000"

RE: How to implement DFU for blinky sample code with LED status logs for nRF54L15

DanielNG — Mon, 29 Sep 2025 12:33:20 GMT

Hi did you include this config from the instructions in step 3.1? Add "

CONFIG_PM_PARTITION_SIZE_MCUBOOT=0xF000

" in your mcuboot.conf

If you also want logging and serial recovery, you need to add an overlay to change the default uart console to a different uart. This is because on nrf54l15, both mcu-mgr and console are on &uart20