Can I upgrade my iPodTouch 4G to iOS 4.2 if I jailbroke it with greenp0ison month ago

[manimalfully]

I don't know if I can upgrade it without losing my jailbreak that I did with greenp0ison like a few months ago when greenp0ison and limer1n had that fight and released stuff on the same two days.

Sorry for being so noob (if I am being n00b?) lol

 

[viperGTS]

you can upgrade, but youll lose your jailbreak and some traces of it will remain. if you sent it in for repair youll be rejected. its best to restore to a current version if youre jailbroken.