https://devzone.nordicsemi.com/f/nordic-q-a/10134/flashing-softdevice-with-the-latest-nrfjprogI haven&#39;t updated my copies of the nRF tools, or mBed&#39;s nRF51 code for some time. I just did and now it seems my old method of flashing no longer works. I was doing something like: nrfjprog --erase-all --programs s130_..._.hex --program my_firmwareen-USTelligent Community 13Mon, 09 Nov 2015 10:24:00 GMThttps://devzone.nordicsemi.com/thread/37590?ContentTypeID=1Mon, 09 Nov 2015 10:24:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cba390ef-5d6b-4e1b-b4bf-c0a8a5012d88Einar Thorsrud<p>In general, you can program the device using nrfjprog version 7.6.0 in the following way.</p> <p>Erase all, program SoftDevice and verify:</p> <pre><code>nrfjprog.exe --family NRF51 --program s130_softdevice.hex --chiperase --verify </code></pre> <p>Program application and verify (use <code>--sectorerase</code> in addition to erase old application before programming):</p> <pre><code>nrfjprog.exe --family NRF51 --program nrf51422_xxac_s130.hex --verify </code></pre> <p>Apply reset in order to start the application.</p> <pre><code>nrfjprog.exe --family NRF51 --reset </code></pre> <p>You only need the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk51.v9.0.0/examples_ble_dfu.html?cp=4_1_0_4_3">Bootloader</a> if you use DFU.</p><div style="clear:both;"></div>