https://devzone.nordicsemi.com/f/nordic-q-a/42370/nrf52-bootloader-over-esp12eHi all I&#39;m using nRF52 DK with 14.2.0 SDK. I created a LED blink project for testing and extract its HEX file. I uploaded the program to the nRF52 over USB (J-Link-Keil IDE) and the HEX file over ESP12E (SWD) to compare the register values between theen-USTelligent Community 13Fri, 11 Jan 2019 10:03:57 GMThttps://devzone.nordicsemi.com/thread/165104?ContentTypeID=1Fri, 11 Jan 2019 10:03:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2d63ae6d-2cbe-4b70-9df5-d10506b93b4atesc<p>Hi,</p> <p>&quot;Working&quot; and &quot;not working&quot; may mean a lot. What is the behavior of the device when not working, and what is the behavior when working?</p> <p>What register values are you comparing? Have you extracted the hex file and UICR entries, (e.g. using &quot;nrfjprog --readcode --readuicr filename.hex&quot;,) in both cases?</p> <p>In the non-working case, if it just does not run the application after programming is done, it may be that it is just missing a reset to start running.</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>