@Robin, I'm surprised seeing you using Espruion Web IDE for updating MDBT42Q based Espruino! How could I have missed that this is now released / available... Documentation at http://www.espruino.com/Puck.js#firmware-updates still requires you to use the same process as from the very beginning...
The only common thing across all boards is the reset: power on with button pressed.
That it fails is - I assume - that a different boot loader is used than the other Espruino boards (chips) do.
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