https://devzone.nordicsemi.com/f/nordic-q-a/92113/application-code-is-not-working-when-using-dfuHi. I have a problem using dfu bootloader. SDK : 17.1.0 SD : 7.2.0 device : nrf52840 dfu code : secure bootloader pca10056_s140_ble uECC : 13.0.0 I implemented application code with peripheral sensor. I used twi and spi in applicationen-USTelligent Community 13Tue, 20 Sep 2022 04:54:43 GMThttps://devzone.nordicsemi.com/thread/386982?ContentTypeID=1Tue, 20 Sep 2022 04:54:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ef7853ee-d219-4094-b2c2-8e9f2591d30fEugene Yu<p>Hello Youngjun,</p> <p></p> <p>The bootloader is a separate project.</p> <p>So, to control something in the bootloader, you need to implement the code inside the bootloader project as well.</p> <p></p> <p>Thanks,</p> <p>Eugene</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/386981?ContentTypeID=1Tue, 20 Sep 2022 04:52:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:08e20184-152f-449d-9ad6-3a086c9d4426Youngjun<p><span>I implemented the code again from the new project.</span></p> <p><span>And, it works.</span></p><div style="clear:both;"></div>