So far, Apple fighting jailbreaking with rather passive manner by simply putting some new security in place at each new version of iOS. With the release of iOS 5.0, Apple has apparently decided to take it jailbreak very seriously. According to the group of hackers from the Dev Team, it would not be possible to downgrade iOS firmware after the 5.0 update done, even by saving the famous “SHSH blobs” for connoisseurs.
For the Dev Team, Apple could prevent the downgrade iOS firmware to a previous version which is a clear fight against the jailbreaking. For now, the jailbreak iOS 5.0 devices can not permanently, that is to say, it is mandatory to use a computer to force the start of the unit. The Dev Team has obviously more than one trick up his sleeve, but it will not publish anything until the release of IOS 5.0 for the general public.
Source: Dev Team
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