I hope it comes out real soon! My father needs it bad for his brand new ATT 3GS to work with his Hong Kong provider. Cannot downgrade to 3.1.2 because of no previous 3.1.2 Cydia hashes.
When he had the 3G(which he lost, now he is back to his old 2G), he accidentally upgraded firmware, luckily I only needed to re-JL the phone. When his 3.1.3 comes out he better now accidentally upgrade again like some of you jackasses.no offense..
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Taken