https://devzone.nordicsemi.com/f/nordic-q-a/95450/uploading-dfu-ota-to-nrf52840-using-nrf-connect-sdkI am trying to use an ESP32 board to upload OTA DFU from SD card to NRF52840 board. I am using ZCBOR library to encode and decode requests and responses I am sending over BLE. I successfully managed to implement echo, reset, image list commands anden-USTelligent Community 13Mon, 09 Jan 2023 14:17:52 GMThttps://devzone.nordicsemi.com/thread/403880?ContentTypeID=1Mon, 09 Jan 2023 14:17:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:22124e63-3ea2-445c-8aaf-1fd5a2e53fd1Sigurd<p>Hi,</p> <p>Simon was able to do DFU from one nRF52840 to another nRF52840. The code is here ,&nbsp;<a href="https://github.com/simon-iversen/ncs_samples/tree/master/central_smp_client_dfu">https://github.com/simon-iversen/ncs_samples/tree/master/central_smp_client_dfu</a>&nbsp;, he needed to do some changes to&nbsp;zcbor_decode.c . Maybe that&#39;s relevant in your use-case as well.&nbsp;</p><div style="clear:both;"></div>