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New September 2017 iMacs

There are many reasons why one would want to downgrade the OS on a computer. At the top of the list is compatibility with existing mission-critical software.

Apple says the current iMacs purchased from Apple's online store (that ship with High Sierra preinstalled) cannot be downgraded to macOS Sierra.

Does anyone know whether this is correct or not?

Previously, one could purchase iMacs preinstalled with Sierra and downgrade to El Capitan.

This was because the hardware revision at the time was released while El Capitan was the "current" OS.

The same is true of the current (as of 4 October 2017) iMacs i.e. when they were released, Sierra was the "current" OS.

Would appreciate any information!

Cheers

Robin

Macs can only boot from the OS version they came with originally. That has always been the case. If you order a new model which was originally rolled out in 2016, then you may be able to install/boot from an OS version which was used at that time even though the later build wound up having a newer OS installed. Here is a list of build numbers:

Find the macOS version number on your Mac - Apple Support

Use the Mac operating system that came with your Mac, or a compatible newer version - Apple Support

最後更新：2017-10-04 13:59:49

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