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By MM596
#69323 I think I found the problem.

I've flashed another NodeMCU with exactly the same file, and with this, everything works fine! I also tried to reflash the original one with a standard Firmware and than reflash it with my custom one, but it still fails.

So maybe there is a hardware problem with this Board I have got. Really strange problem, but if it's only a hardware problem I am ok with buying a new one.

Thanks for all your help!