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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.
@Ingmar_Guillaume
I actually had two types of problems:
one was where the ESPTool would report an "Invalid header". The solution of adjusting the ESP_XXX_Blocks I found on the net, although I can't seem to be able to find the link anymore
The second one was where the ESPTool would just stop, probably waiting for eternity for the serial to come back.