How to Update Your Jailbreak/>?

[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 4.00/4.01/4.02(jailbroken) or watever ...So how would i update my ipod 3.1.2 to 4.01/2
Thankss
please make it simple
I need to do this becaus ei want to be up to date and my cydia wont load when i go on it it just takes me back to spring board after a minute..

[p3bguin911]

do you have blobs backed up?
If so download 4.1 firmware run tinyumbrellas TSS server and shift restore in iTunes and look for your 4.1 firmware. After that just run greenpoison or limera1n