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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.
@Raik
FYI: same happened to me when upgrading to v2.06.
I did the usual: download zip file from espruino.com/download on my phone and used nRF Toolbox.
I didn't pay attention to it sitting next to me because for the previous time that worked fine.
When I looked at the watch a minute later it show the same error message from OP.
So I tried again and it stopped with an error at 2%.
Error messages where something of the line of "Invalid parameter" and something else. I tried a couple of times without success.
What eventually helped was switching BT on the phone on/off again.