https://devzone.nordicsemi.com/f/nordic-q-a/61776/dfu-serial-issue-on-nrf52832-dkHi Nordic, I am using the nrf52832 with the Development kit and the 14.2 SDK. I have followed the steps in https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.3.0%2Fsdk_app_serial_dfu_bootloader.html to generate theen-USTelligent Community 13Tue, 26 May 2020 14:00:43 GMThttps://devzone.nordicsemi.com/thread/251738?ContentTypeID=1Tue, 26 May 2020 14:00:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3b93825d-85f3-4221-9df4-5f5c20026eb0Hung Bui<p>Hi ,&nbsp;</p> <p>I assume you were testing with&nbsp;\bootloader_secure_serial _debug version ?&nbsp;</p> <p>Please make sure you do a chip erase before testing, the reason is that the start address of the bootloader is stored in UICR and it has to be written with correct address.</p> <p>When it&#39;s running both LED 1 and LED 3 should be lit up. And if you use debug version you should see RTT log.&nbsp;</p> <p>I attached here my hex file that worked fine on my computer.&nbsp;</p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-f2488f0101d748d9b016dc8c9a8eeb3e/nrf52832_5F00_xxaa_5F00_s132.hex">devzone.nordicsemi.com/.../nrf52832_5F00_xxaa_5F00_s132.hex</a></p> <p>You would need to flash the S132 v5.0 prior to this hex.&nbsp;</p> <p></p> <p></p><div style="clear:both;"></div>