I'm finally the happy possessor of a completely free laptop. Following some tutorial online I was able to librebooting it (meaning that now I also have a free BIOS) with some rom flashing. I installed Artix Linux on it and it's ready to go :D The only sad thing is that, to have some sort of "libre hardware", I had to go back to 2008; in fact no processor after that time is free from backdoors in it. It's really depressing to think that.