• I meanwhile found the old firmware distributions and tried 1.85 - but apart from a different API (compared to 2.05) I often encounter communication failures (lost characters when uploading) which prevent me from testing...

    Communication errors can be solved by disabling "Reset before Send", but then the program runs havoc almost immediately => the old version behaves even worse than the new one

    This is strange as I made my first experiments with Espruino on BBC micro:bit with 1.85 - and I can't remember these problems (my boards are still the same and weren't touched since then).