Mbed Studio, NRF52840, unable to upload code

I’m trying to use Mbed Studio with NRF52840 DK. I’m able to compile a project for this target but not upload it.
After connecting the board the message appears: “Warning: The detected device ‘USB Composite Device’ does not support debugging. Debug functionality has been disabled.”

Does this mean that neither debugging neither flashing is possible?
I can upload a hex file using JLink, but it would be nice to do it directly from Mbed Studio.

Hi Strange_v,

For better debugging with Mbed Studio, you should replace your on board firmware with DAPLINK, the latest firmware can be found here, https://armmbed.github.io/DAPLink/.