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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
Ahh, ok - then sorry about the corruption issue, but hopefully that's the last time you'll see it.
Pre-2v12 firmware could mess up 'storage compaction' in such a way that some bits of flash memory at the end didn't get cleared. If it started trying to write a file over an un-cleared area it could really mess things up - which I guess is what happened here