MCUBOOT unable to confirm image stored on external flash partition, it keeps as pendinghttps://devzone.nordicsemi.com/f/nordic-q-a/127503/mcuboot-unable-to-confirm-image-stored-on-external-flash-partition-it-keeps-as-pendingHello, Currently working with NCS v3.10 and using SMP service with external flash to store image in a custom board. I&#39;m capable of upload zipped application using DFU button on nRF Connect App or Device Manager App as you can see in the attached picturesen-USTelligent Community 13Thu, 19 Mar 2026 07:23:18 GMTRE: MCUBOOT unable to confirm image stored on external flash partition, it keeps as pendinghttps://devzone.nordicsemi.com/thread/563634?ContentTypeID=1Thu, 19 Mar 2026 07:23:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c6fc594f-a6a5-4341-868c-1ff12701c50cVidar Berg<p>Hello,</p> <p>I don&#39;t immediately see anything from your configuration that explains why the bootloader fails to activate the update from the secondary slot, but leave it pending. But the secondary slot too small compared to the primary slot, which could be a potential problem. The documentation recommends it to be 70% of the primary slot when using image compression. Is image compression needed since you have external flash.</p> <p>Are you seeing any warnings or errors reported in the bootloader log?&nbsp;</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>