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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
Good news, thanks for update. Previously I did not find FCC ID page but it looks like it is this one https://fccid.io/2AHFT226 , the User Manual says ID205 - but as you already got it opened this is no help.
And if you are reverse engineering by examining the board traces and would also want firmware, then this link points to ID205 veryfit pro OTA download zip (public http link to their servers). depends what is easier but one can get e.g. display initialization code etc. Recently I have used ghidra decompiler and got a bit familar with it and it is sometimes quite helpful. It even tries to show you C code and sometimes it is more readable than assembly (and sometimes not).