How To: Jailbreak iOS 12 to iOS 12.1.2 on Your iPhone

Jailbreak iOS 12 to iOS 12.1.2 on Your iPhone

With Unc0ver, Pwn20wnd was the first to successfully jailbreak an iPhone and iPad running iOS 12 up to 12.1.2. Unfortunately, the method is limited to A8X to A11-powered devices, which placed it firmly out of reach for newer, A12 models like the iPhone XS. However, if you have an XS, XS Max, or XR and have held off on updating, a stable jailbreak tool has finally arrived for you.

For those unfamiliar, jailbreaking means unlocking restrictions on iOS to gain access to apps and tweaks not allowed by Apple. Doing so lets you transform your iPhone's interface and features, by way of the Cydia or Sileo apps. And while the list of available tweaks have shrunk due to how difficult jailbreaking has become, a steady stream of compatible tweaks continue to trickle out and keep the community alive thanks to passionate developers.

That said, the earlier Unc0ver jailbreak method works for iOS devices powered by A8X to A11 processors, which ranges from the iPhone 6S to the iPhone X. The latest Chimera tool, on the other hand, expands on this initial list to feature support for A12-powered devices, meaning the iPhone XS, XS Max, and XR.

The process is pretty straightforward for both methods, but because they're semi-untethered, you'll need to re-enable the one you use with the same steps below each time your iPhone reboots or shuts down. Besides that, it's also worth noting that the Unc0ver tool installs Cydia into your iPhone, while Chimera uses the newer Sileo app.

Things to Consider

Before you jailbreak your device, we need to reiterate that Unc0ver only works on A8X to A11 devices, which means that only the following iPhones can support this method:

  • iPhone X
  • iPhone 8/8 Plus
  • iPhone 7/7 Plus
  • iPhone 6s/6s Plus
  • iPhone SE

Chimera also covers the devices listed above, as well as the iPhone XS, XS Max, and XR. Besides that, you'll also need to keep in mind that neither tool will work if you've recently updated your device to iOS 12.1.3 or higher. If you were lucky enough to downgrade to 12.1.2 before Apple closed the window or have a firmware version that falls between iOS 12 to 12.1.2, you're safe to continue below.

Step 1: Download & Install UncOver or Chimera

There are a few different ways to install the Unc0ver tool on your iPhone in order to jailbreak. The first method is ideal, though, Apple could cause issues with it in the future. The second method is better, except that it requires you to redo the process unless you have a paid developer account. As for Chimera, there's only one good option.

Method 1: Open TweakBox & Install in Safari (UncOver Only)

Before you go this route, it's very important to note that Apple will revoke certificates for unauthorized apps from time to time and prevent you from installing Unc0ver over Safari as a result. That said, if this method isn't working for you, be sure to scroll down to the second method to jailbreak your iPhone. We'll post an update once certificates become available again, so stay tuned.

Open Safari on your device to get the ball rolling, and head to next.tweakboxapp.com. Once inside the site, go to the "Apps" tab by either tapping on the "Apps" tab along the top or swiping left. Select the "Tweakbox App" once inside. From there, scroll down and select "unc0ver Jailbreak" to open to its page.

Next, hit the red "Install" button within Unc0ver's page, then tap on "Install" again on the confirmation prompt that pops up. The app will now install on your iPhone, so wait a moment or two for the process to complete. Exit out of Safari, and proceed to the next step once the icon for Unc0ver appears on your iPhone's home screen. Don't open the app up yet!

Method 2: Install Using Cydia Impactor (UncOver & Chimera)

You can install Unc0ver or Chimera using Cydia Impactor to sideload either tool into your iPhone. Of course, you'll need a Mac or PC if you choose to go this route, along with the latest IPA file for either one, which you can download into your computer by clicking on the link below.

Once you have all the files you need, the process for sideloading either tool using your computer basically involves plugging your iPhone into your Mac or PC using a USB to Lightning cable or USB-C to Lightning cable, opening Cydia Impactor, and dragging the IPA file for Unc0ver directly into it. Enter your Apple ID when prompted, and wait for the process to complete. Be sure to check out our tutorial at the link below if you need a more detailed guide on this topic.

If you've chosen this method, please keep in mind that due to Apple's restrictions on free accounts, you'll need to sideload the IPA for either Unc0ver or Chimera every seven days if you used a regular Apple ID. If you have a legitimate Apple Developer ID, on the other hand, you'll only to reinstall once a year.

Ultimately, it doesn't make sense to pay Apple $100 for developer privileges, considering sideloading is relatively fast and easy. To add to that, your certificate's weekly limit doesn't affect your iPhone's jailbreak in any way — provided it stays powered on.

If it shuts down for any reason, however, and more than a week has passed, you'll need to drag and drop the IPA file onto Cydia Impactor again and go from there. At any rate, proceed to the second step once you've successfully sideloaded either Unc0ver or Chimera into your iPhone.

Step 2: Trust Your Profile

You'll still need to trust yourself as a developer before you can open your jailbreak tool of choice — irrespective of what method used in the first step. So don't open the app just yet, and follow the menu below to get into "Device Management."

Settings –> General –> Device Management

Once inside the Device Management page, tap on either "Lebo International Investment Development" if you installed Unc0ver via Safari, or tap the Apple credentials you entered if you sideloaded Unc0ver or Chimera with Cydia Impactor. Next, "Trust" either one on the following page. Now, hit "Trust" one last time from the prompt that appears to finish up, then exit out of Settings, and continue on to the final steps.

Step 3: Delete iOS Update from Storage (If Needed)

Before you jailbreak your iPhone, you'll still need to get rid of any iOS software updates you may have saved inside your phone's storage. Otherwise, executing a jailbreak will result in a fatal error and failure. That said, we recommend playing it safe to ensure the process is as smooth as possible.

Settings –> General –>
iPhone Storage –> iOS 12.x.x

Open the "iPhone Storage" menu to check for saved iOS updates. Scroll down and tap on "iOS 12.x.x." From there, hit "Delete Update," and confirm its deletion from the prompt that appears.

Step 4: Open Either UncOver or Chimera & Execute the Jailbreak

You're now free to commence with jailbreaking your iPhone, so disable all internet connections and enable Airplane Mode, then open either the Unc0ver or Chimera app, and hit the "Jailbreak" button. Note that the process is done in stages, so you'll need to reopen either app after your iPhone reboots, and repeat the process at least three times for the jailbreak to successfully kick in. You'll see a few "Notice" pop-ups the first couple times that you'll need to hit "OK" on.

Jailbreaking using Chimera.

Once your device has been jailbroken successfully, a super fast full-screen "Jailbreak Completed" notification will briefly flash to notify you (Unc0ver) or just respring outright (Chimera). Once it boots up, an icon for either Cydia (Unc0ver) or Sileo (Chimera) will now be present on your home screen. The way is now clear for you to open either app and start installing various (available) tweaks to customize your iPhone and truly make it your own. You can even install Sileo from Cydia if you'd rather use that over Cydia.

Important Notes

Though we've already mentioned it above, we need to stress that both jailbreak methods are semi-untethered, which means you'll have to re-enable the jailbreak as shown on Step 4 each time your iPhone powers down — intentionally or otherwise. That being said, you don't need to worry about re-enabling tweaks and mods you've set, as they will automatically work once your jailbreak kicks back in.

Also note that the process may differ slightly between devices, in terms of how many times you'll to repeat the process in order for the jailbreak to bite. While testing Unc0ver on an iPhone 8 on iOS 12, for instance, we found that the jailbreak finally installed after more than 15 attempts involving multiple reboots. But on an iPhone X running iOS 12.1.2, it only took three times for both Unc0ver and Chimera. So be prepared to try and try again if your iPhone fails to jailbreak the first few attempts.

Finally, it's important to mention that while you can install and use Chimera to override your existing Unc0ver-based jailbreak, doing so will effectively disable Cydia, and by extension, all the tweaks you've installed using that app. This means you'll need to reinstall your tweaks again using Sileo.

We'd love to get your feedback regarding this jailbreak method, so don't hesitate to leave a comment below to let us know how smooth (or rough) the process was overall for your particular iPhone. Also, be sure to mention any issues you may have encountered, along with the iOS firmware you're currently on.

Cover image and screenshots by Amboy Manalo/Gadget Hacks

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4 Comments

Followed instructions but when going to "Trust Your Profile" the only available choice in Device Management is "Beijing Yuxinyicheng Keji..."

I am not going to "trust" an unknown name that is not "Lebo International Investment..." as indicated in the article! :(

The developer profile changes frequently, so keep that in mind when jailbreaking. On the iPhone SE I've had jailbroken since iOS 11, for example, I've had to "trust" several developer profiles every time I've had to re-enable the jailbreak due to the iPhone turning off after several weeks (or even months!) of being on.

You can read about how profiles work in our detailed guide on certificates/profiles.

Had jb for a few weeks working fine iOS 12.0 iPhone X. Yesterday had to restart phone because it crashed,

tried to open uncover to re-jb, app wouldn't open says need to trust, clicked on verify app no change deleted uncover app now it won't install. When I try to install it doesn't appear on my home screen. Any ideas?

Jailbreaked today and noticed no Tweeks available in my Ipad.. Any suggations?

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