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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.
@Gordon
What is the filesystem type you are formatting to? It should be fat32, not exfat.
And this is on a normal Espruino board, via the micro SD slot? Sure seems strange - plenty of people have been using this without issues.