Pod2g, hacker and former member of the chronic dev team, recently found an untether exploit in iOS 5. He now tweeted that people who would like to jailbreak their iOS 5 device shouldn’t update to Apple’s upcoming firmware version 5.0.1. Because Apple changed the way SHSH blobs work, you can no longer downgrade to a previous version of iOS, even if you saved your SHSH blobs. You can still downgrade to iOS 4 if you have those SHSH blobs saved, but if you want to upgrade to iOS 5, you can only get the most recent firmware.
Note about 5.0.1 : don’t update if you plan on jbking : the bug Charlie MILLER found can simplify exploits dramatically and will be closed.
Pod2g later tweeted: “I didn’t tell 5.0.1 would never be jbken but it will certainly take more time.”
We would still recommend to stay on iOS 5.0 until we know if iOS 5.0.1 will ever be jailbroken (if the bug is fixed in 5.0.1, the hackers will probably wait for the next major release to use their next exploit). A fix for the battery issues might also be released through Cydia after the jailbreak is out.
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