Partition Mojave HD to run Sierra

Started 3 months ago | Discussions thread
Tom_N Forum Pro • Posts: 19,170
Re: Easiest method

Here are two articles that might be of interest.

MacWorld UK – How to dual-boot Mac: run two versions of macOS on a Mac

MacWorld UK – How to downgrade macOS Big Sur to Catalina or older

"Regret upgrading to the new macOS? Here's how to revert from Catalina to Mojave, or Mojave back to High Sierra, or even back to Sierra or older. You can go back to the old macOS!"

It sounds like things do get more involved if you are (a) trying to downgrade, (b) trying to downgrade to Sierra or earlier, and (c) trying to put the older OS on a HFS+ volume.

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