https://devzone.nordicsemi.com/f/nordic-q-a/18962/rtc1-not-reset-after-dfuI&#39;m using an app timer to blink an LED while in the bootloader. Initially I was configuring an app timer when the bootloader started up and never stopped it, assuming the reset would clear any RTC1 settings. I noticed that following a DFU, anythingen-USTelligent Community 13Mon, 16 Jan 2017 19:39:07 GMThttps://devzone.nordicsemi.com/thread/73288?ContentTypeID=1Mon, 16 Jan 2017 19:39:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b368502e-6fb3-4d0f-a721-2f91d02916b4Ian<p>Hi Hung, I&#39;m using freeRTOS which configures the RTC1 registers, but I assume since the timer wasn&#39;t being stopped that it wasn&#39;t able to be reconfigured. I reset the timer on application start as per your suggestion. Thanks for the help.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/73289?ContentTypeID=1Fri, 13 Jan 2017 10:32:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:da4fec01-f193-4115-8f88-c9e4db6cbf8bHung Bui<p>Hi Ian,</p> <p>After DFU the bootloader won&#39;t reset. It branch directly to the application. So if you don&#39;t stop the RTC it will keep running when you switch to application with all the settings. You should stop the RTC/apptimer prior to jump to application. And in your application, you should make sure all the registers are re-configured. Should not expect all the registers are at the reset state when you start your application.</p><div style="clear:both;"></div>