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macOS sequoia 15.2 update Mac Pro 2019 failed

Just tried updating 2019 Mac Pro from MacOS Sequoia 15.1 to 15.2 and it failed showing a circle with a line through it. Went to link provided - If your Mac starts up to a circle with a line through it - Apple Support

“A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.”

Reinstalling from recovery login now. Anyone else have this problem?

Mac Pro, macOS 15.1

Posted on Dec 11, 2024 12:40 PM

Top-ranking reply

RottenAppleBrainWorms

Level 1

14 points

Posted on Dec 11, 2024 8:39 PM

OWC Thunderbay 4 drives not loading after 15.2 update. I've never encountered issues prior. All drives are APFS formatted. They load fine on MacBook Pro with Mac OS 15.1.

Anyone else with OWC Thunderbays might want to follow this advice which I came upon after the fact...from OWC blog: "When you upgrade to macOS 15.2, I suggested you complete the upgrade while the enclosure is disconnected from your Mac and then reconnect it once the upgrade has completed. This will ensure that your Mac will run correctly during the upgrade process."

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19 replies

mike-h

Level 1

20 points

Dec 14, 2024 9:35 AM in response to RoaringRatFilms

For people investigating this issue please confirm specific device models and connection type eg OWC ThunderBay 6 / Thunderbolt 3

For drive enclosures please confirm if still failing to boot even with an empty enclosure. eg empty OWC ThunderBay 6 / Thunderbolt 3 with no drives

Dec 11, 2024 7:04 PM in response to mike-h

Just FYI, my RAIDs are all done through Apple Disk Utility, not SoftRaid.

Dec 12, 2024 1:54 PM in response to Craig Rumpel

Someone here suggested unplugging everything but a keyboard, mouse and monitor to do the update. Once it completes, try them one at a time after you actually can login to 15.2.

Dec 12, 2024 6:35 PM in response to RottenAppleBrainWorms

Same here. Ran fine all day.

macOS sequoia 15.2 update Mac Pro 2019 failed