Hi NiLuJe, thanks for replying, I've been reading through that thread already and now your response actually confuses me more
I saw your reply to CoryJJohnson saying that the title of the thread is 3.X so it covers pretty much everything, however now when you mention a "specific JB" which leads me to think it's not the "generic" 13N that you're referring to.
Worst case if as knc1 suggest I try it will it simply not work? My worry is trying it and then getting into a tight spot like Monovertex got himself into which required him to run Kubrick.
As for the Kindle itself I'm 99% sure it's untouched, the guy I bought it from said he barely used it and when I mentioned that I was planning on Jailbreaking it he said he had never really done any of that. It isn't here with me now but when I get home I'll connect it and see if I can find any telltale signs it's been modified.