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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
Strange... That all looks good - the services and any stored code should get totally overwritten after doing something like that.
Are you sure you connected and executed that code on the same Puck.js, and not a different one?
edit: I literally just tried an update from 1v91 after wiping everything and it seems to work fine. Could you maybe try using a new battery? I guess it's possible that the firmware update itself failed halfway through and that's what is causing the crashes?