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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
Did you mass erase the device before flashing and/or do you flash whole firmware including softdevice and bootloader (openocd should show several sections flashed)? I'd suggest to first build MDBT42Q without any changes at all, it should work too.
Starting from MDBT42Q is good, it does not need anything special so it should work in any nfr52832 device if you build and flash it correctly.