Hello
I will command a new iMac Retina 5K 27" with High Sierra installed. (Buy iMac - Apple)
Could you tell me if it possible to downgrade this kind of machine to Sierra ? Is it compatible ?
Regards
iMac, macOS High Sierra (10.13.1)
Because Mac's require a specific build versions and the older version does not support the new Mac.
see > Use the Mac operating system that came with your Mac, or a compatible newer version - Apple Support
You might be able to install the previous macOS version onto an external drive and get it to work. But because of macOS's (EFI, Recovery and Container) complexity, I would not recommend forcing it onto or even into a partition on the internal drive.
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Downgrade Mac OS on last iMac 5K 27"
