@aaronwi: The sticky arguably mainly targets FW > 5.6.5.
The PW2 is alone in being in the peculiar situation of potentially being vulnerable to three different JB methods: The factory one (which *should* work), which you followed; the 5.6.5 one, which you were pointed to in another thread; and the <= 5.4.4.2 one, from this very thread.
The sticky chooses the path of least resistance (to keep things simple), that means it only details the one that works everywhere: the factory JB.
Yes, there are specific (older) FW ranges (depending on device) where downgrades *are* possible. That has also been elided from the sticky to keep things simple

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