@chilady1: The full ChangeLog is hidden in a spoiler in the first post, but, basically, yes, that's awfully old, you probably should update, just to avoid hitting weird old bugs
. You should be able to upgrade it simply by installing the latest version on top of this one.
One small caveat: If you updated your Kindle since, and it's something more recent than 3.2.1, you'll probably have to update the jailbreak first. (And yes, in this case, you'll have to uninstall it first [use the uninstaller from the latest version]).
As for the fonts hack: Do read the small print in the first post, it's not necessarily the most user-friendly thing in the word, and it can badly bite you in the ass on some configurations. The most important thing to remember might be to disable any password/parental control features you might have enabled before trying it: that should help avoiding resorting to a hard factory reset in case of troubles.