iOS 12.5.5 Jailbreak possibilities

iOS 12.5.5 Jailbreak – Everything, unc0ver, checkra1n, chimera

Here is everything about iOS 12.5.5 Jailbreak and possibilities, How to download iOS 12.5.5, How to update, checkra1n, unc0ver, chimera compatibility.

Apple releases iOS 12.5.5 with Important security improvements for older devices that don’t support iOS 13 and newer. Nearly always you can use Settings App to update your iPhones.

It is a minor update that is limited to correcting security problems. Most likely it is the patch to prevent the jailbreak of unc0ver/chimera works, we did not test it yet, but if it is the correction of that security problem,  according to the programmers of this new system, it is a jailbreak for all devices that cannot be patched.

Being a chain of vulnerabilities, perhaps Apple has managed to patch some of them but hey, in any case, if you are not interested in jailbreaking your iPhone or iPad, you can update as always in the Settings AppGeneralSoftware update.

If you are not bothered by any jailbreak and you only care about installing the latest updates on your iPhone or iPad, you should download iOS 12.5.5 immediately. Follow the steps on how to do that over the air:

  • Plug your iPhone to a power outlet
  • Connect to Wi-Fi
  • Launch the Settings app
  • Navigate to General > Software Update
  • Once the latest update shows up, tap on Download and Install

It may take some time to download and install the update, so connect your device to a power outlet when everything is running. When you are done, you can start using your iPhone as usual.

If you intend to install the update cleanly, see the IPSW section below if you can do it completely.

iOS 12.5.5 Jailbreak Status

Here we have listed iOS 12.5.5 all jailbreak possibilities according to our security research. By referring to following research report you can get an idea about unc0ver, chimera, checkra1n jailbreak compatibility status.

unc0ver Jailbreak

unc0ver is a Semi-Untethered jailbreak tool, it is currently compatible with iOS 11 – iOS 14.3 excluding iOS 12.5.5

unc0ver jailbreak is currently unavailable for iOS 12.5.5 because apple fixed the previous kernel bug in this new iOS 12.5.5 update. so if you are willing to jailbreak your iPhone/iPad our advice is to please stay on your current version.

Also, we can hope the developer of the unc0ver team pwn20wnd will update the tool to support iOS 12.5.5 jailbreak soon.

unc0ver is not yet support for iOS 15

Note: if you are waiting for get online jailbreak experience use Pikzo Repo Extractor 

learn more about unc0ver Jailbreak

Chimera Jailbreak tool

Chimera is another Semi-untethered Jailbreak tool for the iOS 12 series, according to our research chimera is compatible with apple’s latest iOS 12.5.5.

The chimera jailbreak developer Coolstar just posted the quote on the Discord channel.


How to install chimera latest version without PC- Chimera Online Guide

How to install chimera new version with PC – Chimera PC guide.

You can check out more about chimera from the official chimera jailbreak blog

Download iOS 12.5.5 IPSW Firmware Files

For the full firmware, installation follow the tutorial posted below

Step 1- Back up All the Things!

Back up everything before proceeding. So, grab your iPhone or iPad and make a backup using iTunes or iCloud. continue to the next step when finished.

Step 2- Check if Your iPhone and iPad is Compatible with iOS 12.5.5

  • iPhone 5s
  • iPhone 6
  • iPhone 6 Plus
  • iPad Air
  • iPad mini 2
  • iPad mini 3
  • iPod touch (6th generation)

Download Firmware File for Clean Install iOS 12.5.5

Download the correct firmware file and save it to your desktop:

Install iOS 12.5.5 Using iTunes

After you have backed up everything and downloaded the iOS 13 firmware file, follow the steps below:

Note: Turn off Find My iPhone before proceeding. You can do so by going to Settings > Apple ID > Find My iPhone.
  1. Connect your iPhone or iPad to your computer or Mac using a lightning cable. Please use the original Lightning Cable or MFI certified one that came with your iPhone. Do not use cheap, fuzzy, uncertified cables.
  2. Launch iTunes and wait until your iPhone is detected. If you are asked to trust the computer on your iPhone or iPad, tap on Trust. You will even be asked to enter your device’s passcode.
  3. Click on the small iPhone-like icon in the top left corner.
  4. Hold down the left shift key (Windows) or the left Option key (MacOS), then click the iPhone Restore button.
  5. Select the iOS 13 / iPadOS firmware file you downloaded earlier.

Now let iTunes extract the firmware file, restore your device, and make sure everything is done. The best process should not take more than 15 minutes.

Once the process is complete, you can jump to the Hello screen, where you can start setting up your device up to date, or restore your files and settings to a previous restore.

Security content of iOS 12.5.5 – By Apple

iOS 12.5.5

Released September 23, 2021


Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation)

Impact: Processing a maliciously crafted PDF may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Description: An integer overflow was addressed with improved input validation.

CVE-2021-30860: The Citizen Lab


Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation)

Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Description: A use after free issue was addressed with improved memory management.

CVE-2021-30858: an anonymous researcher


Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation)

Impact: A malicious application may be able to execute arbitrary code with kernel privileges. Apple is aware of reports that an exploit for this issue exists in the wild.

Description: A type confusion issue was addressed with improved state handling.

CVE-2021-30869: Erye Hernandez of Google Threat Analysis Group, Clément Lecigne of Google Threat Analysis Group, and Ian Beer of Google Project Zero

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