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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
@FransM thanks for letting me know. Not being able to change the settings actually sounds a lot like an issue that was fixed a few weeks ago in the actual watch firmware - the on-watch filesystem could get corrupted in a way that didn't allow a file to be modified once saved (in this case, settings). It's rare that it happens, but there is a chance it'll happen to you again with the current watch firmware.
If you update the firmware now (either to 'cutting edge' or just the default 2v05 release): https://www.espruino.com/Bangle.js#firmware-updates
Then hopefully it'll be sorted and won't happen again.