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The new firmware iOS 4.2.1 for Apple iPhone, iPad, iPod Touch is coming soon, and since there is some ‘confusion regarding the jailbreak and unlocking the device, developers of the Dev Team have decided to stock of the current situation.
The exploit this utility Limera1n GeoHot and the original Pwnage2 pod2G and allows instant jailbreak for any firmware version IOS.
For the kind of untethered jailbreak instead will have to wait a while ‘, as the hacker Comex must demonstrate compatibility with the final version of IOS 4.2.1. For the moment the operation was confirmed with the IOS, the beta3 IOS 4.1 and 4.2.1.
With regard to Unlock the terminal, there is currently no solution to unlock the iPhone with IOS 4.2.1, although the Sheriff Hashim hackers have already found a possible solution, so it’s only a matter of time.
Therefore, until a utility release will be available, you should not upgrade to iOS 4.2.1.