https://devzone.nordicsemi.com/f/nordic-q-a/110796/inquiry-regarding-dfuHello, I am writing to seek advice on whether there could be any issues if the DFU Service is always available. Currently, the devices we are selling allow the DFU Service for a limited time only when a DFU signal is received through BLE Uart messagesen-USTelligent Community 13Fri, 03 May 2024 12:31:15 GMThttps://devzone.nordicsemi.com/thread/481793?ContentTypeID=1Fri, 03 May 2024 12:31:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:afb8e7e1-cb16-4d8b-808c-2731be5d405cAmanda Hsieh<p>Hi,&nbsp;</p> <p><span><span dir="ltr">The secured bootloader has the signature validation which ensures that only signed updates will be accepted.&nbsp;</span></span></p> <p><span><span dir="ltr">-Amanda H.</span></span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/481648?ContentTypeID=1Thu, 02 May 2024 22:35:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6175498b-c0ae-4050-8e2b-c326f164caf9TAEYOUNG<p><span>I&#39;am using &#39;Buttonless DFU without bonds&#39;.</span></p> <p><span>Could there be any security or functional issues if it is always activated?<br /><br /><br /></span>ref link :&nbsp;<a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v14.0.0%2Fservice_dfu.html">infocenter.nordicsemi.com/index.jsp</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/481593?ContentTypeID=1Thu, 02 May 2024 14:11:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1d8369a0-2f64-4507-96c4-0115a8c1fc00Amanda Hsieh<p>Hi,&nbsp;</p> <p>Are you using the nRF5 secured bootloader or NCS mcuboot?</p> [quote user=""]Currently, the devices we are selling allow the DFU Service for a limited time only when a DFU signal is received through BLE Uart messages.[/quote] <p>I think it should be fine if it only allows DFU under specific conditions that only you know.</p> <p>Regards,<br />Amanda H.&nbsp;</p><div style="clear:both;"></div>