iPhone Can I take my 3GS back to unjailbroken but unlocked?

[BigRed1]

I bought my 3GS from a family friend after their AT&T contract expired. I had to jailbreak and unlock via the iPad firmware hack for use on T-Mobile.

I'm currently on 5.0.1 with 6.15.00 bb.

I'd like to eventually get my gps back. I honestly don't care AT ALL about having the jailbreak. I only have the JB so I can be unlocked and work on T-Mobile.

If I get the person I bought the phone from to ask for the unlock from AT&T, can I just upgrade to iOS 6 and be functioning? Do I have to do the baseband downgrade from 6.15.00 first?

If I can't get the person to ask for the unlock from AT&T, can I still downgrade the baseband and stay at 5.0.1 (I didn't get the blobs for 5.1.1)?

Thanks for any help on this - I'm at that dangerous level of knowledge that allows me to get far enough to really mess things up.

 

[dhlizard]

Use TinyUmbrella to see if any hashes are saved

You can downgrade the iPad baseband as per here -->
http://blog.iphone-dev.org/post/26534086824/baseband-freedom
iClarified.com has a tutorial.

 

[BigRed1]

Thanks - I won't be able to check for a few hours.

 

[BigRed1]

Tiny Umbrella won't run on my machine (32 bit Intel Mac Mini). Any other ways to check?

 

[TriJetHero]

In cydia at top of first page

 

[thelatinist]

Isn't this all irrelevant? If he can get his friend to request the unlock from AT&T, can't he just downgrade his baseband using Redsn0w (being careful to select the correct 5.0.1 ipsw) and then do a DFU mode restore to 6.0? Am I missing something?

 

[BigRed1]

That's what I was really hoping. So I do have to downgrade the BB before I update to iOS6?

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Cydia's first page tells me: SHSH: iOS 4.1, 5.0.1.

 

[TriJetHero]

Option generation...

or a simple ebay IMEI unlock would do the trick as well