https://devzone.nordicsemi.com/f/nordic-q-a/15528/nrf51822-ek-mbed-bootloaderWhen I plug the nRF51822EK (PCA10024) in via USB while holding the reset button down, it mounts as &quot;MBED LOADER&quot; rather than &quot;MBED&quot;. This page developer.mbed.org/.../ Indicates that you can reprogram the MBED bootloader this way. I tried using theen-USTelligent Community 13Thu, 04 Aug 2016 14:19:07 GMThttps://devzone.nordicsemi.com/thread/59304?ContentTypeID=1Thu, 04 Aug 2016 14:19:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d9f402a5-4ed2-425c-8f34-d5330d66ee46Ole Bauck<p>It should work for PCA10024 (I just tested), can you try with <a href="https://www.nordicsemi.com/eng/nordic/download_resource/53481/4/8980233">this</a> one instead?</p><div style="clear:both;"></div>