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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
Glad it's sorted, and thanks for the update!
Ahh - right. I think the wording in the Firmware Updater a bit confusing. There are effectively two bootloaders - there's the one that you see as an app in the app loader (this is JavaScript that sets the watch up ready for apps), and there's the DFU bootloader which is some very low level code that runs as soon as the watch reboots. It's the latter that the firmware updater is talking about.
I'll add some changes to the firmware updater so it only refers to the DFU bootloader as 'DFU', and has some more explanation in there to avoid this in the future.