https://devzone.nordicsemi.com/f/nordic-q-a/9621/how-can-i-fix-my-pca10028-boardHello Everybody, My development board type is Nordic nRF51 - DK pca10028 board link I press Boot/Reset button and plug in the USB cable, then the LED5 is blinking,Now entered the bootloader mode,At the moment on the computer I can see a BOOTLEADER driveen-USTelligent Community 13Wed, 14 Oct 2015 07:08:16 GMThttps://devzone.nordicsemi.com/thread/35559?ContentTypeID=1Wed, 14 Oct 2015 07:08:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ef4877e7-847c-40ba-be67-fc16d14497b1Stefan Birnir Sverrisson<p>Hi Jack</p> <p>Please read the <a href="https://www.nordicsemi.com/eng/nordic/Products/nRF51-DK/nRF51-DK-UG/38677">user guide for the nRF51-DK</a>. Start with following chapter 3, the Getting Started chapter</p><div style="clear:both;"></div>