checkra1n is a jailbreak tool with support for most generations of iOS devices. The app can be used to jailbreak all iOS devices between A5 to A11 including iOS 12.3 up to iOS 13. checkra1n is a semi-tethered jailbreak tool that requires a computer to start the jailbreak. If you own a supported iDevice and can connect it to your Mac, you are closer to jailbreaking the system.
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