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Redsn0w
The redsn0w program (at version 0.1) was originally a quickpwn-like implementation of the 0x24000 Segment Overflow for the iPod Touch 2G. However, due to the theft and exploitation of the quickPWN name by quickpwn.com, as of firmware 3.0, quickpwn was discontinued and redsn0w (at the time, version 0.7) was converted into a jailbreaking tool for all current devices as well as providing unlock support the iPhone 2G. As of version 0.8, the iPhone 3GS can also be jailbroken through redsn0w. It is currently closed-sourced but the executable is being worked into several third-party GUIs as the underlying engine as it can also be used as a commandline tool.
Credit
Exploit
For iPod Touch, iPhone and iPhone 3G, see: Pwnage 2.0
For iPod Touch 2G, see: 0x24000 Segment Overflow Credit for this exploit work goes to a mixture of the Chronic Dev and the iPhone Dev Team. Arm7_Go used to upload the oversized LLB required to take advantage of 24kPWN.
For iPhone 3GS, see: 0x24000 Segment Overflow iBoot Environmental Variable Overflow