https://devzone.nordicsemi.com/f/nordic-q-a/72913/update-via-uart-without-custom-bootloader-embeddedHello, We have a lot of boards (more that 5000) witch embedded a nordic NRF51822 to scan beacons. the person who designed the card did not plan any bootloader on the NRF. we program only a sofdevice (s130) and an application before send the boarden-USTelligent Community 13Wed, 17 Mar 2021 13:26:58 GMThttps://devzone.nordicsemi.com/thread/300430?ContentTypeID=1Wed, 17 Mar 2021 13:26:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ab925e3a-5060-45db-ba57-cf6db5265fc8Kenneth<p>There is no bootloader by default no, we do have example implementation of various bootloaders that can support DFU, but unless you have customized it to fit your product and programmed it during production then it&#39;s not possible no.</p> <p>Kenneth</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/300351?ContentTypeID=1Wed, 17 Mar 2021 10:43:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e509aee3-2904-40db-9580-5021abd5e3abAurelien M<p>Thank you for your answer.&nbsp;<br />There is no default bootloader on the nordic ?&nbsp;<br /><br /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/300345?ContentTypeID=1Wed, 17 Mar 2021 10:39:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6005944b-5bde-49e1-8a4c-8524e5062f23awneil<p>You <em><strong>need</strong> </em>to have a bootloader of some sort to do a firmware update.&nbsp;</p> <p>The only other option is to use SWD.</p><div style="clear:both;"></div>