https://devzone.nordicsemi.com/f/nordic-q-a/56008/nrfjprog-programming-hexHi A nrf52832 device board is programmed with the hex file using nrfjprog command as follow for two times, In the first time programming, the device board is programmed with the hex file with the following command, nrfjprog -f nrf52 -s 123456789 en-USTelligent Community 13Fri, 27 Dec 2019 10:10:32 GMThttps://devzone.nordicsemi.com/thread/226911?ContentTypeID=1Fri, 27 Dec 2019 10:10:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6ae695e3-ecff-4f18-8536-a9a9e61f2908Turbo J<p>I don&#39;t see any error handling for your commands above. Is it possible that you just missed the write command error printout?</p> <p></p> <p>Nitpick: The chip erase commands use a different j-link serial number. That would mean the chips are not programmed and erased properly.</p><div style="clear:both;"></div>