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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.
@Jean-Philippe_Rey
I just gave it a try, but it seems to stay at 0% flashing.. Even here I think the device needs to already have a bootloader inside to work properly...
Anyway thank you for your help, and also for pointing me to this app, it should be helpful in some cases.