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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
As for those two features it is about this
https://docs.nordicsemi.com/bundle/ps_nrf52840/page/ref_circuitry.html#ariaid-title5 marked in red in attached picture. Both are optional features that some manufacturers do not use in their designs to save costs (if you scroll up in Nordic docs to configuration #3 with DCDCEN marked "No" the part in red is much simpler).
When the software enables it and the circuit is not working you get crashes/lockups. Why your specific watch may be missing this is a mystery. Maybe they make different versions at the factory for different customers and it got mixed up or maybe it is just one random faulty component on PCB
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