Checkra1n

checkra1n is a semi-tethered jailbreak, developed primarily by Luca Todesco (qwertyoruiop). It's based on the checkm8 bootrom exploit released by axi0mX. checkra1n can jailbreak iOS 12.0 iOS 14.8.1, iPadOS 13.1 to iPadOS 14.8.1, and tvOS 12.0 to 14.7. Experimental support was added in 0.9.9 for the T2 processor. Partial support for HomePod was added in 0.12.1 beta.

checkra1n with support for booting pongoOS on every version supported by A7 and above, down to iOS 7, was added in the 0.1337.0 build - but this simply boots pongoOS and does not jailbreak the device. These builds can be found here and can be used to boot a custom ramdisk and overlay. It requires using the "iOS15" pongoOS branch from GitHub and is currently mainly utilised by palera1n and bakera1n.

The latest mainstream checkra1n build - 0.12.4 beta - does not jailbreak iOS 15.0 or later due to the new iBoot patches needed. As a result, there is no current checkra1n version that does so.