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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
Ok, wow - sorry about this. I'm extremely surprised so many of these have had issues.
I realised later in the evening after I wrote this on friday that the bootloader is actually made of two parts - the bootloader and a few bytes at the end of memory that tell the device that there is a bootloader and where it is.
I'm still working my way through all the messages I got over the weekend, but I'll get back to this in a few hours, will do some more tests and get back to you - it should just be a single line to paste into the Web IDE needed to fix this (after the bootloader has been installed using the above steps).