Create a High Sierra Bootable USB

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Level 1

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Create a High Sierra Bootable USB

I recently took possession of a 2010 iMac with a bad hard drive. I replaced the hard drive with an SSD, and am now trying to create a bootable USB to install High Sierra OS on the iMac. Using my Mac air, and following the instructions on the Apple Store page, I tried to download high Sierra, but each time my system preferences software update launches and I get a message that "OS cannot be found".

What am I doing wrong?

Posted on Oct 31, 2020 2:54 PM

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Answer 1

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dialabrain

Level 10

122,813 points

Oct 31, 2020 3:01 PM in response to Tele-Jam

Open in Safari, Firefox won't work.

How to upgrade to macOS High Sierra - Apple Support

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Answer 2

dialabrain

Level 10

122,813 points

Oct 31, 2020 3:04 PM in response to Tele-Jam

Just to add, if the Mac you are trying to download to came with Mojave or Catalina, you may not be able to download High Sierra.

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Answer 3

Tele-Jam Author

Level 1

8 points

Oct 31, 2020 3:07 PM in response to dialabrain

I'm wondering if that is the problem. I'm trying to do this on a newer Mac air running the latest OS.

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Answer 4

dialabrain

Level 10

122,813 points

Oct 31, 2020 3:17 PM in response to Tele-Jam

Probably. I don't have a new enough Mac to test but I've read posts where people couldn't download an installer older than what their Macs shipped with.

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Create a High Sierra Bootable USB

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