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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
Is it possible that when you uploaded the altimeter program yourself, uploaded it 'To Flash' with the Web IDE rather than to RAM? If so that will have replaced the bootloader.
All you need to do in that case is to go to the App Loader, remove the bootloader and re-install.