https://devzone.nordicsemi.com/f/nordic-q-a/124591/nrf52840-dfu-reset-reason-detection-issueProblem: Reset reason logic works correctly when programming via SWD After DFU programming, reset reasons are detected incorrectly Even after unplugging/reconnecting the battery post-DFU, the logic fails DFU resets are being misclassified asen-USTelligent Community 13Thu, 25 Sep 2025 20:16:53 GMThttps://devzone.nordicsemi.com/thread/549842?ContentTypeID=1Thu, 25 Sep 2025 20:16:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2acedcb6-f967-467d-96be-a74c512194e0Hieu<p>Hello luqman,</p> <p>I expect that in most cases, DFU would reset the device with reason Soft Reset. However, depends on the exact strategy, it can differ, for example, if it requires a manual reset from the end user.</p> <p>What reset value are you having? From the code you post, I see that anything other than reset reason&nbsp;DIF or no reason detected will fall under the else clause. That is quite a&nbsp;many different reasons...</p> <p>Please refer to the RESETREAS register documentation:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ps_nrf52840/page/power.html#ariaid-title35">https://docs.nordicsemi.com/bundle/ps_nrf52840/page/power.html#ariaid-title35</a>.</p> <p>I also recommend consider using the nrfx driver or HAL layer to get reset reason for better code readability.</p> <p>Hieu</p><div style="clear:both;"></div>