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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 think this has happened to all of us on iOS using nRF Toolbox. You have to keep hitting Retry and it incrementally uploads the zip file. Once you get to 100% it should then reboot itself. No idea why it happens, but the upload does actually end up working.
It'll be much easier when the Firmware Update app is out of beta and doing its job; but in the meantime, the nRF Toolbox DfuTarg option will get the job done.