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Unlock iPhone 3GS baseband 5.15.04 and OS 4.2.1?

I have successfully jail broken the 3GS but Utrasn0w doesn't work (phone just keeps saying "searching" when I put in T-Mobile SIM card).  

Does Utrasn0w really support baseband 5.15.04?
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Geoff Millikan
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Geoff Millikan
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2 Solutions
 
Sikhumbuzo NtsadaSenior IT TechnicianCommented:
I would suggest you update to iOS 6.1 and wait for the new jailbreak.
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IphonehelperCommented:
watch this http://www.youtube.com/watch?v=eBum96agsWY
BTW i say to update to iOS 6.1 and preserve your baseband
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darbid73Commented:
Please use this link to decide which unlock will work.

for the jailbreak please use this link.

ios6.1 jailbreak was release hours ago 12.00 EST so things need a little time to settle down.  But you will get it all from those links.

I want to also re-inforce what Iphonehelper has said PRESERVE your baseband do NOT just use an apple iOS to update.  You need to modify it first.
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Geoff MillikanAuthor Commented:
Ok, I'll try these and post back.
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Geoff MillikanAuthor Commented:
Darbid73: sorry, the link (http://www.iclarified.com/unlock/) said there was no known unlock for baseband 5.15.04.  

Iphonehelper:  It was hard to find redsn0w_win_0.9.6b6, and I had to run it in XP compatibility mode but it worked!  Up and running on T-mobile with iPhone 3GS OS 4.2.1 and used the iPad baseband 06.15.00 that came in RedSn0w 0.9.6b6.

Now interested in getting on iOS 6x but will open new ticket for that.  

Thanks so much!!!
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IphonehelperCommented:
I was glad to help
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darbid73Commented:
iclarified is and was correct there is no baseband unlock and you also did not find one.  I hope you read all issues and problems that might exist before putting the iPad baseband on the phone.  I am not sure you can update to ios6 with that baseband.
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IphonehelperCommented:
actually it is possible with a cutom ipsw file

..iPhoneHelper
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