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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@jm
Many thanks for the fast answers.
Sorry, that I ditn't discribe my environment. I use Windows10 and the Espruino IDE in google chrom. I installed the usb-driver, restart the PC, opened the settings and choosed the flasher. Then I followed the instructions . I connect the pico with a usb-cable on the one side. Then I connected the 3,3V to the golden tap on the top (like a teardrop) an pressed the resetbutton. In the next step I put the other side of the usb-cable in to the PC. The lights are not flashing, they are off. The usb-device was not recognised.