https://devzone.nordicsemi.com/f/nordic-q-a/85370/dfu-using-smp-ble-is-validating-and-resting-the-device-on-nrf52840Hi Team, I am using nRF52840 on our custom board. I have enabled SMP for DFU and SMP image management in my build. DFU was successful for the 1st time but when I try to perform DFU for the second time it is not working. The DFU process stops at Validatingen-USTelligent Community 13Thu, 03 Mar 2022 13:50:54 GMThttps://devzone.nordicsemi.com/thread/356075?ContentTypeID=1Thu, 03 Mar 2022 13:50:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b2b873c4-4512-4fd7-bf18-583155c5c581Amanda Hsieh<p>Hi,&nbsp;</p> <p>Can you provide the device log?</p> <p>Is it possible to test the code on nRF52840DK? Not sure it&#39;s the HW issue or not.&nbsp;</p> <p>Are you using the <a href="http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/subsys/mgmt/mcumgr/smp_svr/README.html?highlight=smp%20server%20sample">SMP server sample</a> or adding SMP service to your project as <a href="https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/ncs-dfu">the tutorial</a>?</p> <p>Could you test with this project <a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/peripheral_5F00_lbs_5F00_285161.7z">devzone.nordicsemi.com/.../peripheral_5F00_lbs_5F00_285161.7z</a> (for NCS v.1.9)? Does it also have the same issue?</p> <p>Regards,<br />Amanda</p><div style="clear:both;"></div>