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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
It is something between 5.0 and 5.1, doesn't matter much, should just work with4.0.
Current firmware is using S140 6.0.0 as per https://www.nordicsemi.com/Products/Development-software/S140 , qualification for 5.1 was passed in version 7.0.1