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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.
@user150882
I have now managed to update the firmware, so the problem is fixed, for the moment, if not resolved.
Just so you know, this is the sequence of events. I can't see it being of much diagnostic value, though.
I tried updating the firmware via the app loader using another phone, mindful of what you said about the problem possibly being with the phone's BT, however the result was the same. The app loader was complaining that the Bootloader was old (although it was already updated to the latest version.) Tried updating that: no change.
Then I did another factory reset and updated the bootloader. After that the firmware update succeeded.
None of this makes any sense to me.