Can I somehow install windows phone 8.1 on my nokia lumia 900?

I know that there's no official release/update for it but I want to know what are the possibilities to install a custom firmware on my nokia lumia 900 (windowsphone 7.8). I dont mind using any "ilegal" software/tool or whatsoever. I am willing to try whatever that might work. I have a little knowledge on IT if that could help you. Thanks in advance.

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