The PW2 has a complicated jailbreak history that I have never tried to keep track of, but part of that complication is that it can sometimes be downgraded without jailbreak. Also, are you sure you are not running version 5.12.2.2.2? That is actually the "highest" version despite its number.
Also were you trying PW3 or PW2 firmwares?
Your best bet might be the (supposedly easy with no soldering) hardware jailbreak Popcorn
https://www.mobileread.com/forums/sh...d.php?t=345655