Install that version of OS X, following its instructions.If you are prompted for an Apple ID before it even begins to install, return to Step 1.It will not require an Apple ID to install.That reinstalls the operating system installed on your Mac when it was new.Then, select Disk Utility to completely erase your startup volume.Ĭhoose one of the Mac OS Extended (Journaled) formats.If you do not boot Internet Recovery, you will boot into the existing Recovery Partition, which will only allow you to reinstall your existing operating system.You will need a viable Internet connection, preferably a fast one, and one that does not require a "login screen" for you to connect to the Internet.
#Ntfs for mac sierra 10.12.4 how to
To learn how to use Time Machine read Use Time Machine to back up or restore your Mac.Īfter you have that backup and are satisfied with your ability to recover its files - or you decide that you do not need or want any of the information on that Mac, and understand that it will be irretrievably and forever lost, continue with the steps below.
Please refer to macOS Sierra: Revert to a previous macOS version.Īssuming you have no Time Machine or equivalent backup of your essential files and other documents, create one now because you will need to completely erase that Mac in order to downgrade its operating system from Sierra to any earlier version.
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