@albel727:
https://wiki.mobileread.com/wiki/Kindle_Serial_Numbers
And, yes, <= 3.2 means <= 3.2.0, although the fact that I'm using 3.2 is indeed correct, because that's how Amazon published it, not as 3.2.0. (And, in your case, 3.2.1 != 3.2)
So, nope, you didn't use the right file (in addition to confusing the exact model you actually have, B006 => k3g).