How to Upgrade Your iPhone 4, 3GS Without Updating the Baseband (Mac)

How to Upgrade Your iPhone 4, 3GS Without Updating the Baseband (Mac)

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Alex - February 6, 2013 at 10:59am
Can I use this method to upgrade my 3gs from iOS 4.1 to 6.x ? My iphone is running still BB 5.13.04 and I think I have to keep this BB to stay unlocked ?! I have iphone 3gs new bootrom, AT&T unlocked and jailbreaked via redsn0w running iOS 4.1 Thanks !