According to Dev-Team says, it seems that Apple is changing the system when you sign with the IOS firmware 5, which affect the fact restore previous firmwares. Until now, taking the SHSH saved, anyone could do, although not the last signed by Apple.
Now, using something called BBTicket s, but it's going to change the use of AATicket. The main difference is that now, with the IOS 5 will generate a random number (and not only depend on the UCID or firmware itself) in addition, this verification will take place not only in the restoration, but at the time of boot.
This new measure will affect the jailbreaks requiring a restore to work, but not to those who do not do as limera1n and are tethered, the jailbreak process occurs after the change of firmware and rebooting the device.
This will begin to be effective when the IOS 5 available, so we'll see as the scene progresses the jailbreak then.
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