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you won't be able to boot up the phone. at all.

you will therefore need to restore, which if done incorrectly could mean that your phone is not unlockable until a new ultrasn0w is released
 
you won't be able to boot up the phone. at all.

you will therefore need to restore, which if done incorrectly could mean that your phone is not unlockable until a new ultrasn0w is released

Ok so I should erase everything manually?
 
Restore via iTunes (if unlock is unnecessary), otherwise 'rejailbreak' with something like pwnage tool.

when you 'reinstall' iOS, you are effectively formatting the iPhone. Some will say that you should do this via DFU, I have no opinion as to whether DFU is required or not.
 
Restore via iTunes (if unlock is unnecessary), otherwise 'rejailbreak' with something like pwnage tool.

when you 'reinstall' iOS, you are effectively formatting the iPhone. Some will say that you should do this via DFU, I have no opinion as to whether DFU is required or not.

I'm on a PC so will pwnage tool work?
 
If you have any friends with a mac, you can ask them to use pwnage tool for you to make a custom IPSW which you can use in windows with redsn0w.

What SHSH blobs have you saved?
 
If you have any friends with a mac, you can ask them to use pwnage tool for you to make a custom IPSW which you can use in windows with redsn0w.

What SHSH blobs have you saved?

I have 4.0 and 4.0.1 saved with tinyumbrella and Cydia has 4.0, 4.0.1, 4.0.2, and 4.1 saved for me
 
restore your phone to 4.0.x through iTunes and TU and that won't muck up the baseband that you must've preserved.

then set up phone as new.

then jailbreak (or upgrade to 4.1 SAFELY without mucking up the Basebandn EDIT: I don't think this is possible at the moment) and unlock.
 
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restore your phone to 4.0.x through iTunes and TU and that won't muck up the baseband that you must've preserved.

then set up phone as new.

then jailbreak (or upgrade to 4.1 SAFELY without mucking up the Basebandn EDIT: I don't think this is possible at the moment) and unlock.

TU doesn't preserve the baseband on a 3GS. Just iPhone 4.
It's better to restore to custom 4.1 created by Pwnage IMO. Download one online and then use redsnow on windows to put into limerained dfu mode and restore to the custom jb 4.1 thru iTunes.
 
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