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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.
@fanoush
Does flash writing work too? You can test by creating one file via Storage API or uploading file via IDE. The jsh_sys_evt_handler mainly handles waiting for flash operations to finish so if it does not work properly it may be stuck at writing.