UPDATE 22.1.2018
My old N900 is collecting dust in a drawer for over a year now. However, the time to resurrect this beast might come soon:
https://postmarketos.org/
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About a week ago the USB port on my N900 stopped working. Again. This is another phase of a long battle against that strange force, which keeps breaking it. I have decided to finally give up on micro USB and find a different solution.