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If you are experiencing the -20, please rejailbreak with the no-substrate mode option checked in the app, and see if removing tweaks resolves your issue.
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 Linux (eta son) and Windows, 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.