I bought a brand new iPhone 4 locked on AT&T and I'm trying to get it on T-Mobile, and it never downgrades back to the 4.2 firmware. So, I guess I'm going to have to use my old iPhone 2G until the untethered jailbreak comes out for iOS 4.3. Any help on anything will be appreciated. I'd hate to have to sell this new phone for a cheaper price, and I never even got past the home screen.
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