The iPhone Dev-team member MuscleNerd has tweeted that the 3GS users need to use the latest version redsn0w 0.9.9b9d before installing ultrasn0w compatibility update. According to reports, ultrasn0w 1.2.5 is available on Cydia. iDevices users require a jailbroken device to utilize ultrasn0w 1.2.5.
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