[GeoSn0w]

The iOS 12.0 up to iOS 12.1.2 range can be jailbroken with two different jailbreak utilities. The jailbreak utility that you need to use depends on what kind of device you are using. The A12 devices (iPhone XS, XS MAX, XR and the latest iPad Pros) require Chimera Jailbreak if you want to be able to install tweaks. Chimera comes with Sileo by default, a Cydia alternative that works pretty fine and looks modern.

Unc0ver Jailbreak does have support for A12 devices but it is limited to SSH and ROOT FS remount, so no tweaks, no Cydia and no themes for A12 users. For the iPhone 5S, iPhone 6, iPhone 6 Plus, 7, 7 Plus, 8, 8 Plus and X, Unc0ver Jailbreak does come with Cydia, tweaks, and themes and it is recommended due to its stability.

Now that you know which device you're using, we can choose the appropriate tool.

• If your device is an iPhone 5S all the way up to iPhone X, choose Unc0ver Jailbreak which is available in .IPA format here.
  
• If your device is an iPhone XS, XS MAX or XR, or it is one of the latest iPad Pros (A12 chip), please use Chimera Jailbreak available in .IPA format here.
  

The afore-mentioned jailbreak tools can be used to jailbreak the following iOS versions:

• iOS 12.1.2
  
• iOS 12.1.1
  
• iOS 12.1
  
• iOS 12.0.1
  
• iOS 12.0
  
• iOS 11.4.1*
  
• iOS 11.4*
  
• iOS 11.3.1*
  
• iOS 11.3*
  
• iOS 11.2.6*
  
• iOS 11.2.5*
  
• iOS 11.2.2*
  
• iOS 11.2.1*
  
• iOS 11.2*
  
• iOS 11.1.2*
  
• iOS 11.1.1*
  
• iOS 11.1*
  
• iOS 11.0.3*
  
• iOS 11.0.2*
  
• iOS 11.0.1*
  
• iOS 11.0*
  

*) Unc0ver only.

In order to Jailbreak your device, follow the steps below:

1. Download the appropriate jailbreak tool (Chimera or Unc0ver) from the links above.
   
2. Download Cydia Impactor for Windows, macOS or Linux.
   
3. Open Cydia Impactor and connect your iDevice to the computer using your USB cable. Make sure the device is unlocked.
   
4. Drag and drop the .IPA file into Cydia Impactor.
   
5. Sign in with your Apple ID to be able to sign the file (for CodeSign purposes). Cydia Impactor does not save the credentials.
   
6. On your iDevice, navigate to Settings>General>Profiles and tap your e-mail / Unc0ver / Chimera.
   
7. Trust the application by pressing the "Trust" button. An active internet connection is needed.
   
8. Open the Chimera or Unc0ver Jailbreak.
   
9. Press Jailbreak and wait. If the phone reboots after a few stages it is normal and expected.
   
10. Once the device is back, open the jailbreak application again and tap "Jailbreak" again.
    
11. Wait until the device resprings.
    
12. Congrats! You are jailbroken.
    

For those of you who prefer visual tutorials, here's a video on my channel on how to jailbreak with Unc0ver.



And for Chimera users, here is a video tutorial on my channel on how to Jailbreak the A12 (iPhone XS, XS MAX, XR, latest iPad Pro) devices.

[klutz]

great Geo!

[georgecox15]

Does chimera support iOS 12.1.1 b3 yet?

[GeoSn0w]

Does chimera support iOS 12.1.1 b3 yet?

It should, the exploit works fine there. Doesn't it?

[UnderEu]

You should update this to "up to iOS 12.2"