Downgrade

How to downgrade (or update) to iOS 10.2

Joaquim Barbosa ∙ Updated April 25, 2019

We recently covered the release of Luca Todesco's first build of yalu102. This tool will eventually allow all 64-bit devices to jailbreak iOS 10. iPhone 7 and iPhone 7 Plus will be able to use it on iOS 10.0-10.1.1, all other 64-bit devices will be able to use it on iOS 10.0-10.2.

As the signing window for iOS 10.2 could close at any time, the pressure is on to downgrade to iOS 10.2 if you are currently on a higher firmware. Some people on a lower firmware should also upgrade to iOS 10.2, but not everyone. In this guide, we'll talk you through how to upgrade/downgrade to iOS 10.2 from a lower/higher firmware, if you are one of the people who should be there.

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iOS 10.2.1 and jailbreaking: what are my options?

Joaquim Barbosa ∙ Updated February 16, 2021

What with the release of iOS 10.2.1 and the soon-to-be-closed signing window for iOS 10.2, many people are wondering what the best strategy is for their device. Should they stick with a jailbroken firmware or jump to iOS 10? If they're already without a jailbreak, which iOS version do they need to be on to make sure they get one? What do they need to do to be able to upgrade to iOS 10.2 later, and keep their jailbreak for now?

In this article, we'll quickly go through what we consider the smartest options for each device and iOS version, so that you can (hopefully) make an informed decision.

Extensively updated to reflect beta release of Yalu for 10.2.

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How to verify your .shsh2 blobs with img4tool

Joaquim Barbosa ∙ Updated February 23, 2021

We recently reported how some of the .shsh2 blobs saved with previous versions of tihmstar’s TSSChecker were faulty. One problem affected all iPhone 7 and iPhone 7 Plus blobs, rendering them useless. This issue has now been fixed going forward, though past blobs are invalid.

The other problem was more complex and affected only certain models of certain devices. It is also fixed for blobs saved from now on, but given these occurrences, it is important to be able to check whether the blobs you saved in the past are in fact valid and fit for use with Prometheus.

In this article, we’ll go through how to use another tool from tihmstar’s Prometheus suite, img4tool, to verify that your .shsh2 files are good. This method will clarify whether you are affected by the second problem mentioned above, but will also work in general, when checking the validity of your blobs in future.

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CoolBooter demo: the dual-boot tool for iOS

Joaquim Barbosa ∙ Updated April 20, 2017

Developer Jonathan Seals recently released a new piece of work called CoolBooter, an interesting tool which allows some 32-bit devices to dual-boot different iOS firmwares. With a simple reboot it can allow, for example, switching between iOS 6 and iOS 9. Whilst this functionality is commonplace in the desktop computing world, booting multiple operating systems on iOS devices is much rarer.

Sebastien and I talked briefly about the tool on Let's Talk Jailbreak 157, and in this article I'll give some more info, as well as a video demonstration of it in action.

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TSSChecker now correctly supports iPhone 7 and iPhone 7 Plus

Joaquim Barbosa ∙ Updated February 23, 2021

It seems tihmstar has been busy putting right the flaws in his suite of tools; just one week after he revealed that a bug in his .shsh2 saving tool TSSChecker had led to all iPhone 7(+) blobs saved with it being invalid, a new update restores the ability to correctly save blobs on Apple's most recent flagship device.

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Changes to Apple’s TSS servers currently render Prometheus non functional

Joaquim Barbosa ∙ Updated May 8, 2017

Update: tihmstar has stated that the tool is working perfectly, and that he has used it successfully multiple times today. However, some users have been encountering a TSS server error when using the tool nonetheless.

Hot on the heels of Prometheus' release at the 33c3 convention two days ago, tihmstar's tool for upgrading and downgrading to unsigned iOS firmwares seems already to have hit a snag. Following some changes to Apple's TSS servers today, the nature of which are yet to be investigated, the tool has been rendered non-functional at the present time.

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Prometheus: upcoming tool may allow unsigned iOS upgrades and downgrades

Joaquim Barbosa ∙ Updated May 8, 2017

iOS hacker tihmstar has announced the upcoming release of his tool Prometheus. And no, it doesn't steal fire from the gods for you to foster the burgeoning potential of your race. Instead, he claims it will be the first tool capable of upgrading and downgrading 64-bit iOS devices to unsigned firmwares. If successful, this would be welcome news for the jailbreak community, allowing movement between firmwares for which you have saved your blobs, even after Apple's signing windows have closed.

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How to downgrade from iOS 10.2 to iOS 10.1.1 to prepare for a possible jailbreak

Joaquim Barbosa ∙ Updated May 31, 2019

With the news of a possible upcoming jailbreak for iOS 10.1.1, the race is on for those who have already upgraded past it to downgrade before Apple closes the signing window on them and leaves them high and dry. This guide will walk you through how to return to iOS 10.1.1 from iOS 10.2 (or any other version you may be on, like iOS 9.3.3 or iOS 10.1) so that you will be safe and sound when the window closes, and can wait and see if this jailbreak hype comes true.

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