Pimoroni Explorer: problem setup C/C++ project

Thanks for reply @matt1!
Unfortunately this also does not work for me. Maybe I am trying wrongly.

Have you used this device? https://shop.pimoroni.com/products/explorer
And which repositary do you run? Pico-sdk, pimoroni-pico or something else?
Also which board definition do you use? I have suspicion that none of them is for my board and that is reason why it goes bad.

It would be huge help if you send me some minimal functional example, if you have one. Thanks!