https://devzone.nordicsemi.com/f/nordic-q-a/29451/nrf52-to-nrf51-dfuHi, We have to implement a nRF to nRF DFU. On the nRF51 side a have an external memory with two bankers to perform secure update and downgrade using a bank 2. Now, we are planning to use a Nordic Thingy to perform the firmware update on those devicesen-USTelligent Community 13Mon, 15 Jan 2018 12:41:16 GMThttps://devzone.nordicsemi.com/thread/117103?ContentTypeID=1Mon, 15 Jan 2018 12:41:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:048d4616-501a-42cf-821c-6af2364391edHung Bui<p>Unfortunately, we don&#39;t have an example showing DFU from nRF to nRF. You would need to base on the described protocol and implement the DFU master on the nRF on your own. You can have a look at the <a href="https://github.com/NordicSemiconductor/Android-DFU-Library">DFU library for Android</a> or the <a href="https://github.com/NordicSemiconductor/pc-nrfutil/tree/master/nordicsemi/dfu">nrfutil</a> application as references.</p> <p>Note that by default our bootloader doesn&#39;t support external memory.</p><div style="clear:both;"></div>