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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
Glad it's sorted!
There was an issue in 2v12 where if storage got totally full, in some cases it'd compact fine and then forget to erase the remainder of flash - and that could easily have been the problem I guess. Unfortuntately it was hard to test as all the compaction tests that actually triggered a compaction before storage was full (or by writing larger blocks of data) all worked fine.