My 3GS is on 4.0 but I want to upgrade to 4.2.1 - What do I need to do?

[Snowscape]

Hey guys,

I've been a bit behind on the JB scene now so I'm unsure of what I need to do here.

My iPhone 3GS is currently on 4.0, jailbroken with the soft unlock from ultrasn0w and has a baseband of 04.26.08. I want to upgrade to 4.2.1 since I don't seem to see any reports of the ultrasn0w unlock working for 4.3.2 yet?

I've found the following tutorials at iClarified for:

Jailbreaking - http://www.iclarified.com/entry/index.php?enid=13931

and Unlocking - http://www.iclarified.com/entry/index.php?enid=4253

Is it just a case of me restoring to the stock version of 4.2.1 before proceeding with the above? I remember way back when I upgraded to 4.0 I had to use PwnageTool to build the firmware with the old baseband and so forth... is this still something I need to do if I want to keep my current baseband, or is this a redundant step now?

Really appreciate your help with this guys, thanks in advance!

 

[svenn]

Update to the newest 4.3.2 and use this http://www.iclarified.com/entry/index.php?enid=14573

I just updated my 3GS to 4.3.2 with 05.13.04 using that. Unlocked it and will be selling soon for $$

 

[eastercat]

In case it's not obvious, you never update through iTunes.
If you have your blob for 4.2.1, you can update to that iOS.