![]() ![]() ![]() If you did, then:ġ) Plug the drive containing your Sierra clone into the Mac you want to downgrade, and shut the machine down.Ģ) Boot the Mac whilst holding down the Option/Alt (⌥) key.ģ) At the boot drive selection screen, select your Sierra clone to boot from it.Ĥ) Once logged into your Sierra install on the clone, copy any new files you’ve created since making the clone, from the High Sierra drive, onto the Sierra clone.ĥ) When you have everything you want, fire up Disk Utility.Ħ) Select the drive with your High Sierra beta install on it, and click the Erase button in the menu bar.ħ) Format the drive with a name such as Macintosh HD, and with GUID Partition Table and Mac OS Extended (Journaled) selected. This is by far the easiest option, so hopefully you took the good practice step of making a full Sierra clone before moving to High Sierra. Option 1: If you have a full bootable clone of your Sierra system with SuperDuper! or Carbon Copy Cloner… It will be necessary to wipe the entire drive to reinstall Sierra, so I hope you made a full backup before testing out beta software! I will go through three ways to downgrade, going from easiest to most labour-intensive. Unfortunately, it is not possible to simply install Sierra over the top of a High Sierra install, not least because of the switch from HFS+ to APFS filesystems. If you’ve had enough of the beta experience for now and want to go back to the standard macOS 10.12 Sierra, then read on! ![]() However, it’s still pretty far from ready for mission-critical applications, and many bugs remain. The macOS High Sierra beta is now well under way and many users have been giving it a test run to see what they make of it. ![]()
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