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How do I get past the "do not enter" traffic sign that stops me from installing "Sierra" instead of "High Sierra"?

I booted into rescue mode and deleted the original "High Sierra" installation, but booting from the USB stick with the "Sierra" installer on it still gives me the "no".

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If your MacBook Pro came preinstalled with macOS High Sierra, then you cannot downgrade to older OS as Apple restricted it. You have no other choice. You have to live with it.

  • That's not entirely true. The MacBook Pro Mid-2017 originally came with macOS 10.12.5 (16F2073). So it should be possible to install Sierra. – klanomath Dec 4 '17 at 3:55
  • @klanomath The answer still remains correct that any Mac that comes preinstalled cannot be downgraded any further than it's original OS version. – Shiri Dec 4 '17 at 9:43
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You can't downgrade. Instead, back up all your apps and data and wipe the Mac and migrate things back after Sierra is installed.

You might run into problems if some programs or data upgraded to a new storage format or location.

Worst case, you would need to upgrade again to High Sierra and export any problematic data.

  • I'm not trying to downgrade. The machine refuses to boot the Sierra installer. – tink Dec 4 '17 at 2:58
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    @tink If your Mac shipped with macOS High Sierra then there’s no installing any version of macOS lower than the version it shipped with. – Monomeeth Dec 4 '17 at 3:28
  • @Monomeeth The MacBook Pro Mid-2017 originally came with macOS 10.12.5 (16F2073). So it should be possible to install Sierra (except some newer firmware prevents this...if possible at all - I don't really know this) – klanomath Dec 4 '17 at 3:59
  • @klanomath - the one that landed on my desk today to set-up for a new employee came with High Sierra preinstalled out of a sealed box. – tink Dec 4 '17 at 4:11
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    @klanomath The newest models have started shipping with macOS High Sierra and they do have more recent firmware. – Monomeeth Dec 4 '17 at 4:15

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