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Okay well, I'm going to get an iPod Touch 8gb newest model, & I got a few questions to ask:

-When I buy the iPod, will 4.0.2 be pre-installed?
-Downgrading from 4.0.2 to 4.0 is risky?
-If I jailbreak my iPod via 4.0, will I be able to still visit the App store?
-Will I get to play the free apps from Cydia via WiFi? (i.e. W@W Zombies)
-In this video below v v v do you need 2 PC's? Just curious
[ame]https://www.youtube.com/watch?v=qNOo92BrHH4&annotation_id=annotation_629197&feature=iv[/ame]

That's about it lol I'd appreciate the help, thanks for reading!

-Well 4.0.2 came out on the 12th i believe (Correct me if I'm wrong) I think it might come with 4.0.2 pre-installed on it.

I answered your first question, but I have no clue on the others.