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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.
@AkosLukacs
That's strange. But if connection is lost during DFU (for example my phone has a short screen lock timeout, and just locked itself while sending DFU, breaking the DFU process), you can reconnect and continue where you were. In my experience Nordic's DFU software handles that automagically.
But if I understand correctly, you have tried to send a different firmware version after the initial failure.
Ooor, there is some chance of the DFU package is corrupted during download from the internet. Could you try to re-download the firmware (from espruino.com to your phone), and DFU that?
Woh, this sentence sounds awkward, because you "download" twice :)