I bought a used Thinkpad x200. That is the laptop that is sold with Libreboot and Trisquel GNU/Linux and got a RYF certificate by the FSF. I hope I will be able to liberate my one by myself. First step will be to replace the unfree wifi chip with a free one and installing a libre OS. I'm still a bit afraid of flashing Libreboot and disabling the Intel ME but it looks like I will need some extra hardware to do this this anyway.