https://devzone.nordicsemi.com/f/nordic-q-a/67259/how-to-switch-to-dfu-modeHi.. I want to update the firmware over OTA. For the first time I have downloaded ble_secure_bootloader and softdevice, then I flashed the application file by scanning the dfutarg. Now my question is how to update the firmware now. Without downloadingen-USTelligent Community 13Tue, 20 Oct 2020 09:21:24 GMThttps://devzone.nordicsemi.com/thread/275810?ContentTypeID=1Tue, 20 Oct 2020 09:21:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4d04fa2a-65fb-4e56-ae06-0714106f128fMarjeris Romero<p>Hi,</p> <p>To perform DFU you can follow the steps in this guide: <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/ble_sdk_app_dfu_bootloader.html">https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/ble_sdk_app_dfu_bootloader.html</a></p> <p>For buttonless DFU: <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/ble_sdk_app_buttonless_dfu.html">https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/ble_sdk_app_buttonless_dfu.html</a></p> <p>You can also take a look to this blogpost for how to get started with Nordic&#39;s secure DFU bootloader: <a href="https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader">https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader</a></p> <p>Best regards,</p> <p>Marjeris</p><div style="clear:both;"></div>