You need a Linux environment. The easiest is to download a lightweight Ubuntu ISO (e.g., Ubuntu 20.04 LTS or 22.04 LTS). Alternatively, some community members have created "Checkra1n Live ISOs" – but for safety, stick with official Ubuntu.
The jailbreak will run automatically. Once your device reboots and the PC says "All Done," you can unplug it.
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: It officially supports iOS 12.0 up to iOS 14.8.1, which includes your 12.5.5 firmware.
Third-party developers have created native Windows applications that bundle the checkra1n exploit. iRemovalRa1n download checkra1n for windows ios 12.5.5
Once you have Checkra1n running via USB or a VM, follow these steps to jailbreak your iPhone/iPad:
Jailbreaking is generally safe, but preparation prevents data loss. Make sure you complete these steps before starting the process:
: Use a USB flash drive (at least 256MB) and back up any important files on it, as it will be formatted. Download checkn1x
: It is highly recommended to back up your device via iTunes or iCloud before starting. Jailbreak IPhone 7 With Checkra1n: A Simple Guide - Ftp You need a Linux environment
iOS 12.5.5 represents a crucial update for older hardware like the iPhone 5s, iPhone 6, and certain iPads. These legacy devices no longer receive new major iOS versions but were given this security update to protect them from vulnerabilities. Because the checkm8 exploit remains effective regardless of software patches, checkra1n maintains full compatibility with iOS 12.5.5, offering a stable jailbreak environment for these classic devices.
: Ensure you have the latest version of iTunes installed so your PC recognizes the device.
Warning prompts will appear stating that all data on the USB will be destroyed. Click . Wait for the process to finish. Step 3: Boot Your Windows PC Into the USB Drive Keep the USB drive plugged in and restart your computer.
To download and use Checkra1n for Windows on iOS 12.5.5, you must use a bootable environment or a native Windows tool like , as there is no official standalone installer from the official Checkra1n website Method 1: Checkn1x (Bootable USB - Recommended) The jailbreak will run automatically
Use a high-quality USB-A to Lightning cable. USB-C to Lightning cables often fail to put older Apple devices into DFU mode properly during the jailbreak process.
Follow the on-screen instructions to manually put your device into . This usually involves holding the Power and Home buttons in a specific sequence.
Unlock your iOS 12.5.5 device and select "Trust" if prompted.
Open BalenaEtcher as an administrator, select the ISO file, and select your USB drive. Click and wait for it to finish. Boot into Checkra1n
Best for: Users who want a semi-permanent solution and are comfortable making a USB drive.