How to install coreboot/libreboot on Thinkpad x220

I am interested to replace my BIOS on my Thinkpad x220, because I want to remove the white list for other wifi cards. At first I was thinking to use a modificated BIOS from one of these russian boards, but I don't trust them.

I found out, that it's possible to use coreboot/libreboot. I'm a little bit scared to do it, because I don't have tools to recover the original BOIS on the chip.

So what's the best way to install coreboot/libreboot on my x220?

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