https://devzone.nordicsemi.com/f/nordic-q-a/10817/mbed-with-nrf51-dkhello i want To use mbed for nrf51 dk. i used this link developer.mbed.org/.../ . i am following steps but i can&#39;t copy hex file into bootloader. i got error message &quot;There is not enough space on BOOTLOADER.You need an additional 168 KB to copy theseen-USTelligent Community 13Thu, 14 Jan 2016 08:50:38 GMThttps://devzone.nordicsemi.com/thread/40446?ContentTypeID=1Thu, 14 Jan 2016 08:50:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a4024b04-a557-41e2-a73a-dba65cb6ca70gamnes<p>Hi, Rushin. You should not copy .hex files into the bootloader of the nRF51-DK. The bootloader (invoked by powering on the DK while holding down the reset button) is meant for updating the interface firmware on the on-board debugger (you can have either JLINK or MBED debugger firmware). If you want to program a .hex to the nRF device, you should drag-and-drop the .hex file to the normal MSD which is either named JLINK or MBED. If it is named BOOTLOADER, that means you are trying to update the on board debugger, not the nRF. Hope this clarifies it.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/40445?ContentTypeID=1Mon, 14 Dec 2015 10:10:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c1c40fe8-ec46-4c02-94e3-0ba5f2ba4ff4Anders Strand<p>Did you solve it?</p><div style="clear:both;"></div>