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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.
@ClearMemory041063
Other than trying all the baud rates, can't think of anything else.
Try 9600,19200, 38400, 57600, 74480.
Did you ground GPIO 0 and do a reset to put the chip into flash programming mode?