https://devzone.nordicsemi.com/f/nordic-q-a/114315/nrf9160-modem-delta-update-write-errorHi, we have been trying to implement modem delta updates to our nrf9160 project using DFU target. We send delta .bin file over LTE to our device, and save it to external flash. Then we start copying from external flash to modem using DFU target functionsen-USTelligent Community 13Thu, 29 Aug 2024 12:16:17 GMThttps://devzone.nordicsemi.com/thread/500419?ContentTypeID=1Thu, 29 Aug 2024 12:16:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2ea16c4e-d161-4b24-b5bc-be261f8ee636AndrejP<p>Well, it seems that i managed to find the solution...<br /><br />It was in length of data being copied. When transferring data for modem delta update, they need to be exact size.... we used fixed block sizes for application (mcuboot image type)...<br />Now that i changed code, so that only the size of the image is copied, the update works&nbsp;<span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile">&#x1f642;</span><br /><br />I&#39;m closing this ticket now...</p><div style="clear:both;"></div>