secure bootloader and softdevice update through OTA on nrf51822 sdk12.3.0https://devzone.nordicsemi.com/f/nordic-q-a/29404/secure-bootloader-and-softdevice-update-through-ota-on-nrf51822-sdk12-3-0Hello, I know how to update the application through OTA at the moment, I do the following steps: set the device run in DFU mode by writing 0x01 in Experimental Buttonless DFU characteristic. send the zip file to the device by usingen-USTelligent Community 13Tue, 16 Jan 2018 08:13:55 GMTRE: secure bootloader and softdevice update through OTA on nrf51822 sdk12.3.0https://devzone.nordicsemi.com/thread/116951?ContentTypeID=1Tue, 16 Jan 2018 08:13:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8fb95573-6422-4e75-82c4-205577b50f35Bj&#248;rn Kvaale<p>Great to hear! Could you please mark my answer as correct by pressing the check mark?</p><div style="clear:both;"></div>RE: secure bootloader and softdevice update through OTA on nrf51822 sdk12.3.0https://devzone.nordicsemi.com/thread/116950?ContentTypeID=1Tue, 16 Jan 2018 01:51:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a16fede5-3d23-4b82-9429-aa66cd1f3916vernon<p>Hi Bjorn,</p> <p>thank you very much for you answer, I have updated the bootloader successsfully.</p><div style="clear:both;"></div>RE: secure bootloader and softdevice update through OTA on nrf51822 sdk12.3.0https://devzone.nordicsemi.com/thread/116949?ContentTypeID=1Mon, 15 Jan 2018 15:42:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cbedc4a3-9565-4449-a6b5-727a55d6b3feBj&#248;rn Kvaale<p>Have a look at <a href="https://devzone.nordicsemi.com/blogs/1085/getting-started-with-nordics-secure-dfu-bootloader/">this blogpost</a>. See the section &quot;Update softdevice and bootloader&quot;.</p><div style="clear:both;"></div>