Program nrf52840 sdk board with mbed studio

Hello,

I do not have this hardware and I have no experiences with it, but…
It seems nrf52840 dk uses Segger J-Link . I do not know what is actual state , but Mbed Studio mainly works with DAP-Link/ST-Link and others external probes are experimental - Segger J-Link Support - Mbed Studio - Arm Mbed OS support forum

As second alternative you can try to replace your Segger J-Link with DAP-Link

BR, Jan

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