https://devzone.nordicsemi.com/f/nordic-q-a/55038/loader-how-to-interact-with-the-secure-ble-bootloader-to-do-ota-fw-updateTo the kind attention of Nordic support team, we are very much interested in interacting with your nRF52840 devices preprogrammed with the wireless bootloader and waiting for fw updates. We have already put to the test the bootloader and everythingen-USTelligent Community 13Mon, 02 Dec 2019 15:55:59 GMThttps://devzone.nordicsemi.com/thread/223128?ContentTypeID=1Mon, 02 Dec 2019 15:55:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:17298af7-296a-402b-a669-1e9b39b24cfbastella<p>Ok, thank you for replying us. That is clear</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/223117?ContentTypeID=1Mon, 02 Dec 2019 15:34:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0377d31e-a841-4670-803e-c3061e911384Hung Bui<p>Hi Stella,&nbsp;</p> <p>Please correct me if I&#39;m wrong. You want to make a stand alone DFU master which can do OTA DFU to other devices ? And the DFU master can receive the image via USB ?&nbsp;</p> <p>We currently don&#39;t have an example for BLE DFU master running on nRF52 board. However, we do have example for UART/SPI master on NRF52. You can have a look <a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader#h108sjziaxo3m81rkgr1has5r1d72qtu">here</a>.&nbsp;<br /><br />To create your BLE DFU master code, you can follow what we do in our nRFConnect program. And follow the documentation of the DFU protocol <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/lib_dfu_transport_ble.html?cp=6_1_3_5_2_2">here</a>.&nbsp;</p><div style="clear:both;"></div>