checkra1n 0.12.2 beta is now available with fixes for iOS 14.3 crashes

checkra1n 0.12.2 beta update is now available with fixes for iOS 14.3 crashes on A10 and A10X devices. The update also enables USB on Apple TV 4K.

Unlike previously announced, this update still does not make checkra1n open-source, a 2020 target that the development team missed. The team said on Twitter that they are still working on it but it is not ready for a release yet. However, they have been able to release an open-source version of PongoOS along with checkra1n 0.12.2 beta.

checkra1n 0.12.2 beta

checkra1n 0.12.2 beta fixes crashes on A10, A10X devices

For those who do not know, checkra1n allows you to jailbreak iOS 14 on A9, A10, and A10X devices. If your device is already jailbroken with checkra1n, it is advised that you download the latest checkra1n 0.12.2 beta and re-jailbreak to take advantage of the fixes and improvements in this release.

Note that this release does not mention the inclusion of Substitute 2.0.0 which will replace Substrate for improved performance and stability.

Here is the complete changelog for checkra1n 0.12.1 beta:

Highlighted changes

  • Enables USB on AppleTV 4k during normal system operation

Bug fixes

  • Fixes A10 and A10X devices crashing when trying to jailbreak on iOS 14.3 or higher
  • Fixes an issue where some LaunchDaemons were loaded on platforms where they should not have been


  • A11 devices on iOS 14.0 and above require removing the passcode and enabling “Skip A11 BPR check” in the options. This is not recommended, but it’s there.

Known issues

  • checkra1n does not currently work on Apple Silicon Macs
  • A7 devices will currently not work with the Linux version
  • The exploit may not work as reliably on some devices, such as the Raspberry Pi Zero and Raspberry Pi 3
  • Linux GUI build when using CLI mode doesn’t support auto assertion of DFU mode on advanced Apple TV 4k breakout boards
  • bridgeOS:
    • If you disconnect the cable, then as soon as macOS boots it’ll take over the USB connection and disallow communication with the T2
  • Some users have reported checkra1n crashing when Chinese is set as the only system language. It is unknown whether any other language is affected.

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