Apple officially stops signing iOS 12.1.1 and 12.1.2, thwarting firmware downgrades via iTunes

Following an exceptionally-long and unheard-of grace period, Apple has officially stopped signing both iOS 12.1.1 and 12.1.2 Tuesday evening, a move that packs some serious implications for the jailbreak community.

Update: iOS 12.1.1 beta 3 is apparently still being signed at the time of this writing. Downgrade immediately while you have the chance!

Apple first launched these firmware versions on December 5th and December 17th respectively, each to address small bug fixes and performance improvements in the operating system. But as we know, no software is entirely bug-proof.

Both firmware versions were targeted by a multitude of recently-released exploits, including security researcher Brandon Azad’s voucher_swap exploit and an earlier kernel exploit shared by software tinkerer @S0rryMyBad. Following the release of these exploits, the jailbreak community was advised to downgrade to iOS 12.1.1 via iTunes while they had the chance.

These exploits didn’t go to waste either – Azad’s exploit in particular contributed to the recent release of the rootlessJB 3.0 tool by hacker Jake James, a developer-centric SSH-based jailbreak solution that supports tweak injection. This exploit was also recognized by hacker and unc0ver lead developer Pwn20wnd, and partial iOS 12 support was later added to the unc0ver v3.0.0 pre-release for a small subset of supported devices.

It’s not uncommon for Apple to close the signing window for older versions of iOS, but Apple typically follows a strict two-week signing policy after a new firmware is released. However, in this particular scenario, iOS 12.1.1 went more than a month before Apple stopped signing it.

While some will ridicule Apple for mischievous their behavior in this department, others would argue that Apple is serving its responsibility as a technology company to keep its user base safe. Each firmware update brings bug fixes and improvements that close security holes and prevent a user’s device from being impacted by malware. Unfortunately, Apple’s rapid software release schedule as of late also makes it more challenging for jailbreak developers to keep up.

As always, you can track which versions of iOS are being signed for your device from the ever-so-useful website. You can also download relevant firmware files from the downloads page on iDownloadBlog.

Which version of iOS are you currently running? Let us know in the comments section below.