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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
Hi Gordon,
nRF Toolbox did the trick (with the .zip file) on iPhone 11 Pro Max, iOS 15.1. It worked eventually, but it wasn't a simple one-click operation, as I've written in other comments.
Other than that, this is a great successor to the Pebble, and arrived just as my Pebble battery decided it couldn't cope any more!