OMG, I was about to try to desolder the ESP8266 and replace it with another one I had when I thought to give it one more go. And yeah guess what, it worked :D
I have no idea what did the trick. Very frustrating that I have no idea what the issue was :)
But it works! That's the most important thing. Thank you very much for looking into it!
I'll try to write down all steps with all source files in an instructable and share the link.
And then buy more espruinos and have more fun with them ;)
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