how to upgrade?

[SK1TT3R]

Right, i have a 3g[s] 3.1.2 jailbroken and unlocked with blackr1n and blacksn0w.
Can i upgrade to any of the 4...+ using sn0wbreeze?
If so, do i have to use my shsh, i have them on file for 3.0, 3.1, 3.1.2, 3.1.3, 4.0, 4.0.1? any good tutorials for upgrading the 3g[s]

So really, can i upgrade to 4.0 or 4.0.1 and still be able to jailbrea?.

i read somewhere that it's different to upgrade or downgrade a 3g[s] than a 3g ect.?
thanks in advance.

[Anopsis]

I'm in the same situation. My wife's 3GS has 3.1.3 JB on it and she wants 4. I'm trying to figure out how to do an upgrade to 4.0.1 so I can re-jailbreak. I don't want to do a full restore. Any help would be appreciated!

[i.Annie]

No Sn0wbreeze

Go update to 4.0.1 (shift+restore, not direct update).

Then use jailbreakme to jailbreak (jailbreakme(dot)com in your phone's Safari).

Youll need an official SIM to activate before using jailbreakme.

If you have a Mac, make a custom 4.0.1 with pwnagetool to shift+restore to. No jailbreakme required here.

MAKE SURE YOU GO TO CYDIA TO SAVE YOUR SHSHs. IMMEDIATELY BEFORE APPLE STOPS SIGNING 4.0.1.

You can still restore to 4.0.1 without SHSHs as of today so do it quick.

[Anopsis]

Here's what I did. I downloaded 4.0.1 and did a shift-click Update instead of restore. After the update I went to jailbreakme.com. Everything seems to be ok so far.