![]() Downgrading from MacOS High Sierra Betaīefore anything else, confirm that you have a Time Machine backup to restore to, and that you have a current backup of your important files and data. Failure to do so will result in permanent data loss. Do not proceed without having a backup of your files and data. ![]() Warning: You will be formatting and erasing the hard drive in this process, this will destroy all files and data on the drive. Do not proceed without a Time Machine backup you can use to restore. Important: If you do not have a Time Machine backup made from a prior install of MacOS Sierra or El Capitan, this approach will not work to downgrade because you will not have a Time Machine backup to restore from. Using a prior Time Machine backup offers the simplest way to downgrade MacOS High Sierra. This tutorial will show you how to downgrade from MacOS High Sierra (10.13) beta back to MacOS Sierra (10.12.x) or OS X El Capitan (10.11.x) by using Time Machine to restore a previously made backup.
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