I have a jailbroken iPod Touch 2g non-MC on 4.0, and I want to update to 4.1, but I don't want to have it jailbroken anymore. I don't want to restore my iPod or download any firmware updates from sources other than iTunes. If I just update to 4.1 through iTunes, what will happen? Is it safe for my iPod to do that? And if I decide I want to jailbreak again later, will I be able to? I'm a bit lost in all this jailbreak stuff.