Ipod touch 2 gen update to 3.1.3

Ipod touch 2 gen update to 3.1.3
i am using ipod touch 8GB 2gen now (2.2..)
i want to update my ipod touch but itunes only had 4.0
i heard 4.0 had so many bugs and weakness
so i want to update to 3.1.3

so how can i update and please help

thx

4.0 had so many bugs and weakness<---which..?
apple驗證果度好似話關左3.1.3的更新..
除非有3.1.3的shsh先可以應該~
但你本身2.x應該都無..所以應該唔得~

btw, 我都係ipod touch 8gb 3gen(2gen)..
用緊ios4..jb左...覺得某程度上smooth過3.1.3

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