The Checkra1n GUI will launch. Here is what to do:
Under , click the SELECT button and choose the Checkra1n/Odysseyn1n .iso file you just downloaded. Leave all other settings at their defaults and click START .
Once finished, the Checkra1n app will close, and Cydia will appear on your home screen. You are now officially jailbroken! Important: Understanding the Semi-Tethered Nature
Download a pre-configured, lightweight Linux ISO file containing the Checkra1n binaries (such as the popular jailbreak-focused Linux distributions). Ensure you select a version featuring Checkra1n 0.12.4, which offers optimal stability for iOS 12.5.5. Step 2: Create the Bootable USB Drive Plug your USB flash drive into your Windows PC. Open Rufus . Under the Device dropdown menu, select your USB drive.
Yes, when using the official Linux version via a bootable USB. Never use third-party .exe files claiming to be "Checkra1n for Windows."
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Restart your PC and enter your BIOS/Boot Menu (usually F12 , F2 , or Esc ). Disable in BIOS settings. Select the USB drive as your boot device. Run the Jailbreak :
For users of these devices, iOS 12.5.5 is the end of the road—but it is also a jailbreaker’s paradise. The checkm8 exploit (hardware-based, unpatchable) works perfectly here, and checkra1n offers a semi-tethered jailbreak with Cydia and Sileo support.