good news first, it works.
@ Gordon LD7 lighted up all the time.
Thanks to your and tickTock's help most possible problems could be checked.
So at the end there was only one thing left, I took a new USB-cable out of my box and thats it. Should have done this before, its always the unexpected.
Espruino Web IDE found the port and first test with LED blinking is working.
Thanks for your help and sorry for wasting the time.
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