https://devzone.nordicsemi.com/f/nordic-q-a/126265/single-slot-with-firmware-loaderNcs v3.2.1 &lt;SDK&gt;\nrf\samples\dfu\single_slot I want to try using this sample for SMP over ble dfu, so I tried several times in the nRF Connect and Device Manager in the mobile app, but after adding dfu_application.zip, it always prompts &quot;Invalid imageen-USTelligent Community 13Wed, 24 Dec 2025 05:41:00 GMThttps://devzone.nordicsemi.com/thread/557610?ContentTypeID=1Wed, 24 Dec 2025 05:41:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:130d2004-378b-4c96-a92e-82f584963496brave_niuniu<p>Hi vidar，</p> <p>It is indeed an issue with the app. I don&#39;t know why this problem occurs on Android if the nRF Connect version is lower than 4.29.1, but it doesn&#39;t matter, as long as it works. Thank you for your answer.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/557589?ContentTypeID=1Tue, 23 Dec 2025 14:35:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a6f3887-008d-4516-b438-faf46d24a668Vidar Berg<p>Hello,&nbsp;</p> <p>I did not manage to reproduce this error with iOS. Are you using Android? Please also try to see if you get the same error with my DFU package below.</p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/2475.dfu_5F00_application.zip">devzone.nordicsemi.com/.../2475.dfu_5F00_application.zip</a></p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>