https://devzone.nordicsemi.com/f/nordic-q-a/62044/how-to-connect-nrf52840-to-pcHi I was able to successfully complete the RF output power measurement using nRF52840 DK with the help of Nordic devzone last time. Based on successful measurement, i designed my PCB using nRF52840 dongle reference circuit. (because max poweren-USTelligent Community 13Wed, 03 Jun 2020 12:30:12 GMThttps://devzone.nordicsemi.com/thread/252996?ContentTypeID=1Wed, 03 Jun 2020 12:30:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ec133147-cd58-41e7-8615-7c2e6abede3dAmanda Hsieh<p>Hi,&nbsp;</p> <p><span>nRF52840 Dongle comes preprogrammed with the attached hex file (</span><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-00-13/pca10059_5F00_bootloader.zip">pca10059_bootloader.zip</a><span>), which contains the MBR and Open bootloader with the correct public key. You can also use the&nbsp;<a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/ble_sdk_app_open_bootloader.html?cp=5_0_4_4_2">Open bootloader example</a>&nbsp;project from the SDK, but it does not include the public key needed to update the bootloader itself over USB DFU.&nbsp;The nRF52840 Dongle is not supported in nrfjprog as it does not have a JLink OB on it, so you will need an external debugger to program it. Please see &quot;</span>Using an external debugger&quot; in the&nbsp;<a href="https://devzone.nordicsemi.com/nordic/short-range-guides/b/getting-started/posts/nrf52840-dongle-programming-tutorial">nRF52840 dongle programming tutorial</a>&nbsp;and <a title="SWD interface" href="https://infocenter.nordicsemi.com/topic/ug_nrf52840_dongle/UG/nrf52840_Dongle/hw_swd_if.html?cp=4_0_5_5_6">SWD interface</a>.</p> <p>-Amanda H.&nbsp;</p><div style="clear:both;"></div>