Sorry in advance if I shouldn't post this question here, but everyone seems so friendly here, so I figured I'll give it a try

I got my PW2 just this wednesday, and guess what, it came with 5.4.2. As downgrading seems quite a job, I wanted to ask if this method here really just works on 5.4.0... I'm already jailbroken, want to use CM with calibre. I would appreciate any help, as I'm quite a newbie with Kindle hacking, though not a total newbie with Linux.
\\As this seems to be moved by an admin, I have to add that I referred to denydias How to hack a brand new Kindle

Sorry for the confusion and wrongly placed post...