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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.
@user149714
The trick is to long hold until you see the:
{======= >
You then have to let go BEFORE the lines reach the arrow. It's a timing thing.
Release before and you go to DFU Started... release after and you simply reboot the device.