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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.
@MaBe
try to flash with dio
https://github.com/espruino/Espruino/blob/0c9a8ee0f81804d184f41c14ba67b7c202514537/targets/esp8266/README_flash.txt#L52