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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.
@JumJum
In new IDE sometimes, the list of ports is not refreshed.
In my case it shows available port, but does not connect.
Even after removing USB cable, it still lists the port.
Restarting WebIDE does not change this, port is still listed.
Sometimes then disconnecting USB cable and connecting again helps.
Sometimes it needs an additional reset on Espruino.
Never had this problem with old version.