Limera1n is an exploit discovered by geohot that should jailbreak any iDevice by exploiting the bootrom, so it should work regardless of the iOS version available. Going by this idea, an American has bought an iPad tablet that had iOS 4.2.1 and had the displeasure of discovering that redsn0w could not jailbreak it. The person in question tried several times to jailbreak, but every time the process stopped at the bootrom dump, a sign that the exploit could not be loaded.
I made a trip to the Apple Store today to get an iPad for my old lady (Christmas present). She told me she'd love it jailbroken, so I sat down in front of my computer to redsn0w this 4.2.1 iPad.
One problem–redsn0w 0.9.6b6 could not upload a pwned iBSS (hung at the white screen on OS X, upload timed out and rebooted into jailed state with Windows).
Furthermore, the device constantly stalls when attempting to dump its bootrom. This leads me to believe that the injection vector used via USB has been patched in DFU mode.
He checked the version of the bootrom from his new iPad tablet and luckily we don't have a new bootrom, but it seems that terminals with serial number xx050 cannot be jailbroken using the limera1n exploit. Last year, Apple blocked an exploit by geohot by implementing a new bootrom in the iPhone 3GS terminals, but this year we don't have a new bootrom, but maybe a new method to block the jailbreak. It is not known yet if the exploit was really blocked or not, but it is interesting to see what MuscleNerd has to say.
If Apple had really blocked this exploit, then it is possible to see SHAtter released by the Dev Team to jailbreak future versions of iOS.
Is there an iPhone 4 owner purchased from Cosmote/Vodafone who has had the same experience?
