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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.
@hcchen
Follow Web IDE's instructions to upgrade Espruino board v1.3 firmware from v1.50 to v1.52. During the process the status shown a failure message that I can't remember now.
Now, the board turns on the Red and Blue LED at about 20% light when power supplied and it doesn't work at all because the host computer can't see the COM3 anymore.
My Chrome was version 28 during the upgrading process. Now I noticed the Chrome version should be updated first according to the Web IDE upgrade guide. If this is the reason I am too late to know.