Originally Posted by ihearkat. As an example, a user is currently running 6. When you are constructing a digest using SHA-1, you can actually do it "piecemeal": Normally, I get to write articles or give talks, or leave many-page long comments on various websites and forums on interesting aspects of technology, confusing aspects of business, protocols and the people who standardized them, or new tools that I've been working on; writing these articles can be grueling at times, but at some level the task is not just rewarding, but fun. Designed by Blog Consulting. However, at a high level, what the APTicket is is a single block of data that is signed as a whole and that contains the digest of all of the files that will be used as the device boots. At this point, I think I have described everything I need in order to explain the current situation: 
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As newer devices never had access to install older versions of iOS, these limitations start overlapping. Obviously, this is not the case.
What does that error actually mean? The personalization process thereby involves taking the build manifest, building a TSS request, sending it to Apple, getting the result, and then modifying each of the files that were listed by replacing the signature section with the blobs returned by TSS.
True, this could, 6.1.22 some cases, result in only a tethered jailbreak i. Originally Posted by wrlee.
TSS Center
With a jailbreak program or through iTunes? I now must make a slight detour to describe signatures: Honestly, due to the various limitations on the exploits we have for the reuse of APTickets, not many users are affected by this issue.
Upcoming tool claims to let you restore the device to a fresh version of iOS without losing jailbreak. This is because, in order to better emulate the requests Apple had been making when I first started the service, I filter the manifests I send to Apple to only include information about files that had the partial digests I discussed earlier, as only files that have partial digests are relevant for SHSH.
I thereby encourage users of devices capable aptcket being exploited by limera1n the iPhone 3G[S], iPhone 4, or 4th generation iPod touch to download this tool right now and use it to upload complete TSS information. Most systems use this scheme. Alternatively, they accidentally apticke their iOS installation so badly that they need to restore.
Using the currently released version of redsn0w will still as far as I understand copy the active TSS data 6.1. your device and store them locally on your computer. I'm also going to attempt to explain some background on the process, what the apticmet was, and what users can now do instead. SHSH, the system that I had known a lot about and had spent an inordinate amount of my life building over and over again, due to changing limitations and scale requirements tools to retrieve and store data for, was on its way out; a new verification scheme called APTicket was clearly setup to replace it entirely in some upcoming device.
Sadly, that is not why I have been working on this article: Cydia requests SHSH blobs from Apple and uploads them to my servers whenever it notices you don't have the information stored on my servers. Thankfully, I have been told by MuscleNerd that changes have been made to redsn0w to make any similar situation we may potentially run into in the future where the manifest information being used by our tools differs, causing Cydia to save unusable information something that will be noticed while the signing window is still open in fact, he believes the very first dayallowing things to be corrected.
However, tickets that were downloaded or otherwise obtained by tools such as redsn0wiFaithor TinyUmbrella, will work fine.
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The important detail of the signing process is then to know exactly what aphicket signed. Eventually, with the adaption of TSS, basic verification to make sure zpticket you were installing newer firmware, instead of older firmware arrived. However, the APTicket signs complete digests, not partial digests, and so even descriptions of files that do not have partial digests need to be sent to TSS to get a complete ticket.
Originally Posted by ihearkat.
Additionally, it means that if you have a device you haven't used in a very long time, and many software revisions have been released between then and now, you could choose to upgrade to any of those versions, not just the latest. My idea was to build an implementation of the TSS server, one that could even transparently provide information from Apple by aptickte requests through, that would aptixket able to save information on its way through and then later replay it when you could no longer make the requests for this information from Apple.
Last week, Apple released iOS 6. It therefore happened that developers such as MuscleNerd and iH8sn0w do not personally test their tools against data saved for users by Cydia's TSS client.
Yes, there have been, and will always be a few exceptions to that rule, but for the most part, Apple has done a good job of cutting off the ability to downgrade firmware. It is then my understanding that redsn0w 6.12 be able to upload this information at a later time from your computer.
iOS 6.1.6, 6.1.5, 6.1.4, 6.1.3, 6.1.2, 6.1.1, 6.1
Hi, I'm not sure if this issue is related to the problem I was having aptickst with iTunes telling me my phone was in recovery mode. Are any of the shsh files useful? Not saying it'll work for you if you're having the same problem, but worth a shot. Follow me on Twitter!
Using this exploit, it is possible to downgrade these exploitable devices to any version for which you have your TSS information saved. Apple releases iOS 6.
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