I've jailbroken my Kindle 3 Wifi months ago, however even tough I'm very comfortable with trying things like these I found it quite hard to
understand how:
You update the jailbreak.
You uninstall the jailbreak.
Maybe someone could explain it in simple terms?
The Update part was the one I had more trouble understanding.
Edit: I did manage to uninstall the jailbreak and resinstall it.
I just thought it's worth knowing that some things weren't easy to understand. That's all.