https://devzone.nordicsemi.com/f/nordic-q-a/37135/questions-about-buttonless-dfu-serviceHi support team, I&#39;m using nrf52840 and SDK 15.0. I need to add buttonless dfu service to my application so that my device could be able to upgrade firmware OTA. However,I want to add more limits in the buttonless dfu service. What I want to do isen-USTelligent Community 13Mon, 06 Aug 2018 09:02:37 GMThttps://devzone.nordicsemi.com/thread/142971?ContentTypeID=1Mon, 06 Aug 2018 09:02:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0c8456aa-f875-4174-bbac-2d5c59b7ca15Einar Thorsrud<p>Hi,</p> <p>I have not&nbsp;thought of this issue / use case before. I guess it should work. Alternatively, you could make another open characteristic for entering DFU mode, so that you have two: one that require security and one which is open. If there is a write to the open characteristic and the device has any bonds, then you can ignore the write.</p><div style="clear:both;"></div>