It looks like previous reports about iOS 5 being just as easy to muck around with as iOS 4 were but a short lived reality. According to the latest reports from the Dev-Team (one of the groups that works on iPhone jailbreaks), iOS 5 will make life harder for jailbreakers. Starting with iOS 5, once you’ve upgraded your firmware to the latest version of iOS, you won’t be able to downgrade the device to an older version of the operating system.
What this means is that if you update your iOS device to a newer version, and find out that it is un-jailbreakable you won’t be able to rollback to an older version to jailbreak it. No more upgrading to try out the latest iOS and then going back to the previous version to get your jailbreak back. So you’ll need to be extra patient if you’d like to have the latest version of iOS and want to keep your device jailbroken.
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