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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
I don't see button BTN1 defined, you mentioned the board has one. As you build with bootloader the button is (or recently was) needed to build it properly as it is the way to enter bootloader.
Also if you made several different builds for different boards try to run with added 'clean' make target first to start from clean state.