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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.
AkosLukacs
No, the firmware is signed. You can do it with all other nrf52832 devices from that company because they use SDK11 however this is 52840 chip so with that one they moved to later SDK => signed firware. More info 2 pages back in this topic.