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Level 1

4 points

The recovery server could not be contacted

How can I install the Mac OS X ?

iMac 21.5″, macOS 10.13

Posted on May 12, 2023 5:03 PM

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Level 10

245,177 points

Posted on May 12, 2023 6:06 PM

1. Start up from macOS Recovery

Option-⌘-R

Upgrade to the latest macOS compatible with your Mac.

APFS won't work for Sierra, Sierra needs MacOS Extended Journaled. High Sierra won't work fir APFS on earlier Macs.

What has often worked for others is to use this Restore Method instead of CMD+r keys...

Option-⌘-R

Upgrade to the latest macOS compatible with your Mac.

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