How To Update Jailbroken 3.1.2

[waggy]

Hi, i have a 2nd gen 3.1.2 jailbroken with black ra1n ipod touch.i want to update my ipod to the latest update 4.01/4.02(jailbroken) or watever ...So how would i update my ipod 3.1.2 to 4.01/2
Thankss

[iYeow]

Download TU and save your shsh blobs first and then use Tss Server to help you verify your firmware and use itunes to restore to your intended fw.