https://devzone.nordicsemi.com/f/nordic-q-a/93184/how-to-enable-led-for-mcubootnRF52840 NCS 1.9.1 I have successfully downloaded app_update.bin to flash and rebooted. MCUBOOT copies the new application correctly and it runs fine. The boot process after the download takes about 60 seconds, so I would like my LED to light duringen-USTelligent Community 13Tue, 25 Oct 2022 12:33:29 GMThttps://devzone.nordicsemi.com/thread/392382?ContentTypeID=1Tue, 25 Oct 2022 12:33:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0dda7f15-2cb6-4858-9a1e-54efdf8af954Simon<p>Maybe the <a href="https://github.com/nrfconnect/sdk-mcuboot/blob/v1.9.99-ncs2/boot/zephyr/Kconfig#L578">CONFIG_MCUBOOT_ACTION_HOOKS</a> can be used for this? For example when the <a href="https://github.com/nrfconnect/sdk-mcuboot/blob/v1.9.99-ncs2/boot/bootutil/include/bootutil/mcuboot_status.h#L13">MCUBOOT_STATUS_STARTUP event</a> happens, you can turn on an LED inside your custom&nbsp;<span>mcuboot_status_change function.</span></p> <p><span>Let me know if you have any issues implementing this, and I will make an attempt myself</span></p> <p><span>Best regards,</span></p> <p><span>Simon</span></p><div style="clear:both;"></div>