https://devzone.nordicsemi.com/f/nordic-q-a/71559/dfu-on-nrf52832-nrf52840-from-another-mcuHello, I am trying to do DFU over BLE for nrf52 devices from another microcontroller (ESP32 to be specific), I couldn&#39;t find any data or example code to do this, are there any document that can help in building this?en-USTelligent Community 13Fri, 12 Feb 2021 16:35:10 GMThttps://devzone.nordicsemi.com/thread/294232?ContentTypeID=1Fri, 12 Feb 2021 16:35:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:810cd1f7-f9bf-46d6-a14a-c5157b70601aSigurd<p>Hi,</p> <p>Unfortunately, we do not have a reference implementation for a OTA DFU master/controller running on a nRF51/nRF52. You may refer to the BLE transport documentation if you want to implement your own. Here are the message sequence charts:<span>&nbsp;</span><a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_dfu_transport_ble.html?cp=5_1_3_5_2_2_3#lib_dfu_transport_msc">https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_dfu_transport_ble.html?cp=5_1_3_5_2_2_3#lib_dfu_transport_msc</a></p> <p>And you might find this unofficial serial DFU controller found in Chapter 6 in this blog-post helpful:<span>&nbsp;</span><a href="https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader">https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader</a></p><div style="clear:both;"></div>