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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
you can use some SWD adapter with debugger like e.g. openocd. some ~$2 STLINK V2 clone from ebay/aliexpress or any raspberry pi would do.
check e.g. this https://wiki.pine64.org/wiki/Reprogramming_the_PineTime
PineTime is also nrf52 so basics are the same.