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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
The firmware on those is completely different native code, not Espruino. We do have Espruino running on it but I used SWD pins to install it. OTA is too complicated as you also need to downgrade softdevice and install different bootloader. see topic
https://forum.espruino.com/conversations/388395/?offset=25#17473535