If you are on iOS 15 or 16, checkra1n 0.12.4 is outdated. Look into the Palera1n project, which uses the same exploit but is actively maintained.
Once your device boots, look for the Checkra1n loader app on your home screen. Open it to install Tethering: semi-tethered justatech checkra1n 0.12.4 windows.zip
—a permanent, unpatchable vulnerability in Apple's bootrom—was the "holy grail" of jailbreaking. It led to the creation of If you are on iOS 15 or 16, checkra1n 0
The release of Checkra1n 0.12.4 carries several implications for users: justatech checkra1n 0.12.4 windows.zip
