Problem with a nRF5340

Hello,
I am contacting you today because I recently bought an nRF5340 development kit, as well as several Nordic Thingy devices (52, 53 and 91) and I have been working on those devices for a few weeks now.
I still can't find a way to connect the nRF5340 DK to my computer or my phone, whether by USB or Bluetooth. When I connect the card by USB, it is not detected in the « nRF connect for Desktop » app. However, when I plug the card by USB and turn it on, there’s a green LED that lights up, which means the nRF5340 DK works. Where could the problem come from and how can I fix it ?

Thank you in advance for the feedback.
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