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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.
@tve
Ah, I saw the same but thought it was because I was upgrading from an ancient version. Init code stored in flash has become incompatible and there is not a good check for that. The solution is to erase all flash (erase_flash command to esptool.py) and flash from scratch.
But I've found another issue with my build, so a new one is coming.