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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.
@Gordon
The font size looks a bit big - do you think it's possible that you have a large font size set in Android, and that has meant that there was no room for the nRF Connect app to add the DFU button?
If you don't want to change that, I'd just use the nRF toolbox instructions - the only reason I suggest nRF connect is that it's a useful app to have when using Puck.js. nRF toolbox is marginally less useful :)