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This beta adds an option to boot into no-substrate mode. To utilize this functionality, hold the volume-up button when the apple logo appears until the device finishes booting. From there you’ll be able to uninstall any tweaks causing you issues and reboot to get back to a normal jailbroken state.
checkra1n will eventually support all devices between the iPhone 5s and the iPhone X, however, this beta lacks support for the following devices:
Support for these devices will be added in a later release.
Support for the following devices is experimental, and may require more attempts than usual:
Reliability on these devices will be improved in future releases.
This beta is only available for macOS. Work is ongoing to support Windows and Linux, which will be added in a later release.
At the moment, checkra1n only supports installing Cydia. Support for other package managers is coming soon, and will not require a checkra1n update.