https://devzone.nordicsemi.com/f/nordic-q-a/55576/nrf52840-dongle-softdevicehi. I wonder if nRF52840 dongle has an unchangeable bootloader, and if so, where we can download it. PCB of nRF52 dongle is available on the official website, but not in the software section. Best regards, Mingen-USTelligent Community 13Mon, 16 Dec 2019 01:25:39 GMThttps://devzone.nordicsemi.com/thread/225519?ContentTypeID=1Mon, 16 Dec 2019 01:25:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ff4ba9db-e33c-49bf-9676-d2c600c7115dMing<p>Thanks for your kind. Your message helps a lot.</p> <p>Best regards.</p> <p>Ming</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/225342?ContentTypeID=1Fri, 13 Dec 2019 12:04:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b609f135-6c44-4cc4-b37b-25323c498ef8tesc<p>Hi,</p> <p>The bootloader delivered on the nRF52840 Dongle is attached in the answer to the question <a href="https://devzone.nordicsemi.com/f/nordic-q-a/40924/how-can-i-restore-the-original-bootloader-of-a-pca10059/159115#159115">How can I restore the original bootloader of a pca10059?</a></p> <p>It is based on the <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.0.0%2Fble_sdk_app_open_bootloader.html">Open Bootloader with DFU</a> from SDK 15.</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>