How to revert macOS to the previous version
There are several reasons why you might want to revert to an older version of macOS than the version currently installed on a Mac. Here's how to do it.
Chip is a 30-year Apple industry veteran, is author of 18 commercial Mac software products, and is a former Apple and Sony employee. He began hacking away on Apple computers on the Apple II+ in high school in the mid 1980's, then moved on to the Mac in the early 90's. In a previous life he created the game developer audio tools for Playstation 2 at Sony, and worked on the New World OpenFirmware found in late 90's Macs.
There are several reasons why you might want to revert to an older version of macOS than the version currently installed on a Mac. Here's how to do it.
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