https://devzone.nordicsemi.com/f/nordic-q-a/54983/about-nrf52840-dfuCurrently, there is a project. The situation is that the master nRF52840 communicates with the cloud server through the GPRS232 module, the slave nRF52840 communicates with the master nRF52840，and the zip packages required by the master nRF52840 DFU anden-USTelligent Community 13Tue, 03 Dec 2019 13:25:48 GMThttps://devzone.nordicsemi.com/thread/223344?ContentTypeID=1Tue, 03 Dec 2019 13:25:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:79a22615-b3fe-4d92-b788-8bfd2dd3ad91Simon<p>Take a look at <a href="https://devzone.nordicsemi.com/f/nordic-q-a/47410/firmware-update-dfu-from-server-or-cloud">this thread</a>, which I think answers your questions.</p> <p>Best regards,</p> <p>Simon</p> <div style="left:125px;top:-20.0028px;"> <div></div> </div><div style="clear:both;"></div>