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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
Yes at most one needs to open just one but all other can be updated wirelessly. With a bit of luck even the first one will work as I tried with DS-D9 and generic espruino build. It comes up and can be connected over bluetooth and the rest of HW could be figured out by trial and error from espruino and/or reverse engineering the firmware.
I have another batch of SDK11 nrf52 based trackers, these are too from VeryFit Pro app but there was no sensible metadata so the strings are from firmware binary
The S4000 is interesting as it has GPS however I cannot find any info about it. These are bluetooth names so the product may have different name. Some interesting strings from S4000 binary : sony\gps_cxd56xx_agps.c, oled, spi_flash,PPG_sensor\si117x\si117x_ic.c