iPhone 4 Gevey Unlock Issue

[Jelokin1]

I would like to update my iPhone to iOS5 while still being able to jailbreak it. I use a Gevey to unlock my iphone and I need to make sure I can preserve my baseband while upgrading.

What I have:
iPhone 4
IOS 4.2.1
Baseband 3.10.01

How can I upgrade to iOS5 while preserving my baseband? I have OSX and Windows so software is no issue.

Thanks in advance,
Jeremy

 

[ChAoTiCpInOy]

Pwnage Tool should create a ipsw that doesn't upgrade your baseband. Not 100% sure on that since iOS 5 has some new stuff that supposedly is harder to circumvent.