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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
It'd be handy if you could do a video of the process - if only with what's happening on the iPhone. This update process has been done with well over 10,000 Espruino devices to date on all manner of phones, so I'm pretty amazed that you seem to have found not just one but a whole bunch of them that don't work.
Is it possible you're behind some kind of firewall that is somehow modifying the zip file you download? Maybe you could open the zip file on your phone and check that it only contains
espruino....bin,espruino......datandmanifest.json?