How can I update my 3rd generation iPod touch from iOS 5.1.1 iOS 6.0 My itunes keeps on telling me that my iOS 5.1.1 iPod touch is up to date when I click Check for Update:


iTunes 11.0.2
OS X 10.8.2 
iPod 3rd gen (MC008LL)





I recall that back in the day I used to get the prompt to update to 6.0.. and then I asked iTunes never to bother me about it again. But now I went to iTunes->preferences->advanced->reset all dialog warnings. that still doesn't work.. 

I also tried updating my software from within the iPod itself: Settings->General->Software Update, but I get the exact same message still.. Ideas?
Unfortunately you can't, iOS 6 requires at least an 4th generation iPod touch (as noted in the System Requirements (right hand side) of Apples Update overview).