https://devzone.nordicsemi.com/f/nordic-q-a/70603/nrfjprog-status-3221225477I&#39;m getting an undocumented status value back from nrfjprog when I try to program my dev board: ERROR: command exited with status 3221225477 : nrfjprog --program C:/mdsg/official/Switch/build/zephyr/zephyr.hex -f NRF52 --snr 683389225 --sectoranduicreraseen-USTelligent Community 13Mon, 18 Jan 2021 08:56:20 GMThttps://devzone.nordicsemi.com/thread/289642?ContentTypeID=1Mon, 18 Jan 2021 08:56:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c086e4e4-3baa-4d71-8d3e-174216b3caf2bluetooth_mdw<p>OK, I solved this by updating my nrf command line tools to the latest version. Yes, should have tried this first!</p> <p>nrfjprog version: 10.12.1<br />JLinkARM.dll version: 6.88a</p><div style="clear:both;"></div>