If you’re on the cutting edge of the iOS releases, or you prefer to run a jailbroken version of iOS, you may find yourself having some difficulties in the future. Apple has taken measures to prevent users from restoring older firmware versions of iOS in the latest iOS 5 beta release.
The iPhone Dev Team has revealed that Apple has secured the SHSH blobs:
“Starting with iOS5 beta, the role of ‘APTicket’ is changing — it’s being used much like the ‘BBTicket’ has always been used. The LLB and iBoot stages of the boot sequence are being refined to depend on the authenticity of the APTicket, which is uniquely generated at each and every restore. This APTicket authentication will happen at every boot, not just at restore time.”
What does that mean exactly? Well, for one, you’ll no longer be able to downgrade your firmware because Apple now holds the keys to the kingdom. You will be able to jailbreak, but you will not be able to downgrade your devices as easily.
It looks like Apple’s starting to get real about fighting back against Jailbreakers. But, to be honest, this is a little bit annoying for non-jailbreakers as well. As many of you may know, I’m still rocking my iPhone 3G (the iPhone 5 can’t come soon enough), and the latest updates available for my device really took a chunk out of my iPhone’s performance. I’ve always been able to downgrade if things have gotten a little too messy, but now it’s going to be more difficult to even downgrade for legitimate reasons.