https://devzone.nordicsemi.com/f/nordic-q-a/22123/bootloader-can-t-start-applicationHi , I am using the SD 4.0.2, the SDK is 13.0.0_04a0bfd, and the IDE is IAR 8.11.1 to develop production, I integrated the DFU, and I download and updated the APPLICATION from nRF Toolbox-DFU successfully, but when 52832 reset and run to nrf_bootloader_app_starten-USTelligent Community 13Thu, 18 May 2017 09:26:14 GMThttps://devzone.nordicsemi.com/thread/86914?ContentTypeID=1Thu, 18 May 2017 09:26:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:803e063d-db92-4a4b-8cdf-d29353c23450Hung Bui<p>@chaoren: When you mentioned &quot;but when 52832 reset and run to nrf_bootloader_app_start(MAIN_APPLICATION_START_ADDR), the system reset to DFU again,&quot; you mean the device enter an infinite loop of jumping to application - reset - dfu - to application - reset ?</p> <p>If it&#39;s the case you may need to run the application debug mode and check what cause the application to reset. Most likely there was something caused an assert.</p> <p>I can see that you start WDT in your application, have you made sure you feed the WDT in your application ?</p> <p>When you see the issue, if you do a power reset, would the issue continue ?</p><div style="clear:both;"></div>