how to go from 3.1.3 to 4.0.2 without loosing jailbreak?

[brewmax]

as you can tell im a newbie at this. I currently have a 3g that is jailbroken on using redsnow running the 3.1.3 os. I'm wanting to update to the the latest jailbroken os. could someone point me to a "how to" or tell me exactly how i do this?

do i need to just go to Itunes and update the os from there then rejailbreak it or what?

[Hyperextension]

OMG Search the place. Look around. You will find your answers.

[CaptainChaos]

Find a custom 4.0.2 and then shift/restore to it in iTunes.

[brewmax]

how would one go about finding this?

[itsmejdn]

You can JB 4.0.2 on 3G without having a previous JB.

Update to 4.0.2 via iTunes
Download 4.0 ISPW from Google
Open redsn0w, point to 4.0 and Voila!

[brewmax]

thanks, I have tried that in several places and when i try to put the new ios into redsnow it says it doesnt recognize the ipsw. is this a common problem?

[itsmejdn]

thanks, I have tried that in several places and when i try to put the new ios into redsnow it says it doesnt recognize the ipsw. is this a common problem?

You probably downloaded the wrong version ipsw.

Go to jailbreakmatrix.com
Look under 3G, 4.0.2 section.
Follow instructions.

[brewmax]

ok, ill try it. thanks