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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.
@user6141
Sorry, I lead you down the garden path there.
I did of course write the firmware with -w previously. (without any errors)
This was just to demonstrate that the validating part never works.
The firmware boots and shows no signs of missing any of it's memory.