https://devzone.nordicsemi.com/f/nordic-q-a/37195/how-to-determine-if-a-dfu-update-has-started-when-rebootingI have a situation with the devices my company builds. From what I understand, they&#39;ve been designed with a small flaw, which causes them to sometimes get stuck and require a hard reboot when (among other things) a certain service is running and a DFUen-USTelligent Community 13Tue, 07 Aug 2018 13:04:18 GMThttps://devzone.nordicsemi.com/thread/143230?ContentTypeID=1Tue, 07 Aug 2018 13:04:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:10c9a0be-62d1-4053-9d91-820b1aee8011Hung Bui<p>Hi,&nbsp;</p> <p>Still, your description is pretty hard to understand, both in the previous case and this case.&nbsp;</p> <p>You need to describe to us, with step by step, what your problem is , how you recreate it.</p> <p>We have a fail safe timer that if the DFU update is terminated in the middle and if there isn&#39;t a re-connection the bootloader will simply reset. After it reset, it would either enter the original application (if you are doing dual bank update) or enter bootloader mode&nbsp;again waiting.&nbsp;</p> <p>Our current app should be able to support continual DFU update if it&#39;s interrupted in the middle of transmitting data. You can also modify it to start a fresh&nbsp;&nbsp;as well.&nbsp;</p> <p>But you would need to explain us what exactly the situation when your device can be bricked.&nbsp;</p><div style="clear:both;"></div>