Upgrade iPhone 3GS from 4.3.3 5.12.01 to 5.0.1

[networkguru]

Hi experts
I have a 3GS with specs listed above jailbroken using snowbreeze with custom firmware.
I want to get that phone to 5.0.1.
Can I do a clean restore to 5.0.1 via iTunes?
I know I will loose the jailbreak and unlock.
But does it also update my baseband?

Thanks in advance

[xboxbml]

Yeah create custom 5.0.1 with snowbreeze to preserve bb...I don't unlock so I don't know enough about that...I have 3GS and did this..was on 5.0.1 for a while...works well on 3GS but is more of a ram storage and battery hog than even 4.3.3 is...I went back to 4.2.1...

If u don't preserve bb yes it will update and u won't be able to unlock that bb...I think yours is unlockable so make sure u preserve!! Then JB with redsn0w 0.9.10b4... Untethered!

[i.Annie]

+1. That baseband is unlockable, the baseband should be preserved. A custom fw is absolutely vital, do not upgrade straight through iTunes. Do a shift+restore to custom fw.

[networkguru]

+1. That baseband is unlockable, the baseband should be preserved. A custom fw is absolutely vital, do not upgrade straight through iTunes. Do a shift+restore to custom fw.

So upgrade straight from iTunes is possible but not recommended due to baseband preservation.
Thanks

[i.Annie]

Right...you just want to avoid hitting that "upgrade" button.

[moshikoy]

my advice: don't go to ios 5 it makes the iphone slow as hell

[xboxbml]

Really?....mine worked fine...3GS 32gb...I went back to 4.2.1 cuz it was more of a ram battery and storage hog than even 4.3.3 was...ran fine though...

[i.Annie]

+1. Shouldn't be too much of an issue for 3GS. Won't be as snappy as the 4/4S but it isn't bad.