Pwn20wnd has achieved incredible performance and successfully developed a reliable jailbreak for the A8X for A11 powered iPhones and iPads running on iOS 12 up to 12.1.2. So if you have refrained from updating to the latest version since you originally installed iOS 12, you can now jailbreak your device.
For the unknown, jailbreaking means unlocking restrictions on iOS to access apps and tweaks not allowed by Apple. By doing so, you can completely transform your iPhone's interface and features, using the Cydia app (or even Sileo). And while the list of available tweaks has shrunk due to how difficult jailbreaking has become, a steady stream of compatible tweaks continues to hold out and keep society alive thanks to passionate developers.
It is said that the latest uncOver jailbreak method currently works for iOS devices powered by the A8X to A11 processors. For iPhone, ranging from iPhone 6 S all the way to iPhone X. The process is pretty simple, but since it is semi-untethered you need to reactivate it with the same steps mentioned below each time your iPhone restarts or shuts down.
Things to keep in mind
Before jailbreaking your device, it is important to note that uncOver only works on the A8X to A11 devices, meaning that only the following iPhones are covered by this method:
- iPhone X
- ] iPhone 8/8 Plus
- iPhone 7/7 Plus
- iPhone 6 ] s / 6s Plus
- iPhone SE
Although newer iPhones like X S and X R is not currently supported, uncOver's developers have indicated that the jailbreak method will work for them in the near future. As such, we will be sure to send an update as soon as it becomes a reality, so be sure to stay tuned.
Apart from that, you must also remember that uncOver does not work if you have recently updated your iOS device to 12.1.3 or 12.1.4. If you were lucky enough to downgrade to 12.1.2 before Apple closed the window or have a firmware version that is between 12 and 12.1.2, you are sure to continue below.
Step 1: Open TweakBox in Safari  Open Safari on your device to get the ball rolling and go to next.tweakboxapp.com. Once inside the site, go to the "Apps" tab by either pressing the "Apps" tab at the top or turning to the left. Select "Tweakbox App" once inside. From there, scroll down and select "unc0ver Jailbreak" to open its page.
Then click on the red button "Install" on the uncOver page, then press "Install" again on the confirmation dialog that appears. The app is now installed on your iPhone, so wait a moment or two to complete the process. Exit from Safari and proceed to the next step when the uncOver icon appears on your iPhone homepage. Don't open the app yet!
You still need to trust yourself as a developer before you can open the uncOver jailbreak tool, so don't open the app yet and follow the menu below to enter "Device Management."
Settings -> General -> Device Management
Once on page Device Management press "Lebo International Investment Development," followed by "Trust Lebo International Development" on the following page. Now, turn on "Trust" one last time from the prompt that seems to unpack things. Then exit Settings and proceed to the last steps.
Before jailbreaking your iPhone, you still need to get rid of iOS software updates that you might have saved in your phone's storage. Otherwise, the execution of a jailbreak will result in a fatal error and error. That being said, we recommend that you play it safely to ensure that the process is as smooth as possible.
Settings -> General -> iPhone Storage -> iOS 12.x.x
Open the "iPhone Storage" menu to check saved iOS updates. Scroll down and press "IOS 12.x.x." From there, click "Remove update" and confirm the deletion from the message displayed.
Step 4: Open uncOver & Execute jailbreak
You can now start by jailbreaking your iPhone, then disable all internet connections and enable airplane mode, then open the uncOver app and press the blue "jailbreak" button. Note that the process is complete in steps, so you must re-open the uncOver after your iPhone restarts and repeat the process at least three times for the jailbreak to kick in. You will see some pop-up windows The first few times you have to turn "OK" on.
Once not jailbreaking your device, a super fast full-screen "Jailbreak Completed" message will flash to notify you of the successful attempt. Your iPhone will be respring before you even have a chance to read it, and when it is launched, an icon for Cydia will now be on your home page. The way is now ready for you to open Cydia, and start installing various (available) tweaks to customize your iPhone and really make it your own. You can even install Sileo from Cydia if you would rather use it over Cydia.
Although we have already mentioned it above, we must emphasize that uncOver is a semi-sealed jailbreak which means that you must reactivate the jailbreak shown in step 4 each time your iPhone is controlled – intentionally or otherwise. It is said that you do not have to worry about reactivating tweaks and mods you have set, as they will automatically work when your jailbreak returns.
Also note that the process may differ slightly between units, in terms of how many times you should repeat the process for the jailbreak to bite. When we tested the method on an iPhone 8 on iOS 12, we found that the jailbreak was finally installed after more than 15 attempts of multiple reboots. But on an iPhone X that ran iOS 12.1.2 it only took three times. So be prepared to try again if your iPhone fails to jailbreak the first attempts.
We would be happy to receive your feedback on this jailbreak method, so please do not leave a comment below to let us know how smooth (or rough) the process was for your iPhone. Also, be sure to mention any issues you may have encountered, along with the iOS firmware you are present on.