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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.
@ajkm
I used nRF and followed the instructions to download the zip file first. It was frustrating because the connection to the watch dropped after almost every 1% transfer, but after clicking Retry every time, it eventually got to 100% and rebooted with 2V10.244.